diff --git a/mypy/plugins/attrs.py b/mypy/plugins/attrs.py
--- a/mypy/plugins/attrs.py
+++ b/mypy/plugins/attrs.py
@@ -12,7 +12,7 @@
     TupleExpr, ListExpr, NameExpr, CallExpr, RefExpr, FuncDef,
     is_class_var, TempNode, Decorator, MemberExpr, Expression,
     SymbolTableNode, MDEF, JsonDict, OverloadedFuncDef, ARG_NAMED_OPT, ARG_NAMED,
-    TypeVarExpr, PlaceholderNode
+    TypeVarExpr, PlaceholderNode, LambdaExpr
 )
 from mypy.plugin import SemanticAnalyzerPluginInterface
 from mypy.plugins.common import (
@@ -60,19 +60,16 @@ class Converter:
     """Holds information about a `converter=` argument"""
 
     def __init__(self,
-                 type: Optional[Type] = None,
-                 is_attr_converters_optional: bool = False,
-                 is_invalid_converter: bool = False) -> None:
-        self.type = type
-        self.is_attr_converters_optional = is_attr_converters_optional
-        self.is_invalid_converter = is_invalid_converter
+                 init_type: Optional[Type] = None,
+                 ) -> None:
+        self.init_type = init_type
 
 
 class Attribute:
     """The value of an attr.ib() call."""
 
     def __init__(self, name: str, info: TypeInfo,
-                 has_default: bool, init: bool, kw_only: bool, converter: Converter,
+                 has_default: bool, init: bool, kw_only: bool, converter: Optional[Converter],
                  context: Context,
                  init_type: Optional[Type]) -> None:
         self.name = name
@@ -88,54 +85,35 @@ def argument(self, ctx: 'mypy.plugin.ClassDefContext') -> Argument:
         """Return this attribute as an argument to __init__."""
         assert self.init
 
-        init_type = self.init_type or self.info[self.name].type
-
-        if self.converter.type and not self.converter.is_invalid_converter:
-            # When a converter is set the init_type is overridden by the first argument
-            # of the converter method.
-            converter_type = self.converter.type
-            init_type = None
-            converter_type = get_proper_type(converter_type)
-            if isinstance(converter_type, CallableType) and converter_type.arg_types:
-                init_type = converter_type.arg_types[0]
-            elif isinstance(converter_type, Overloaded):
-                types: List[Type] = []
-                for item in converter_type.items:
-                    # Walk the overloads looking for methods that can accept one argument.
-                    num_arg_types = len(item.arg_types)
-                    if not num_arg_types:
-                        continue
-                    if num_arg_types > 1 and any(kind == ARG_POS for kind in item.arg_kinds[1:]):
-                        continue
-                    types.append(item.arg_types[0])
-                # Make a union of all the valid types.
-                if types:
-                    init_type = make_simplified_union(types)
-
-            if self.converter.is_attr_converters_optional and init_type:
-                # If the converter was attr.converter.optional(type) then add None to
-                # the allowed init_type.
-                init_type = UnionType.make_union([init_type, NoneType()])
-
-            if not init_type:
+        init_type: Optional[Type] = None
+        if self.converter:
+            if self.converter.init_type:
+                init_type = self.converter.init_type
+            else:
                 ctx.api.fail("Cannot determine __init__ type from converter", self.context)
                 init_type = AnyType(TypeOfAny.from_error)
-        elif self.converter.is_invalid_converter:
-            # This means we had a converter but it's not of a type we can infer.
-            init_type = AnyType(TypeOfAny.from_error)
+        else:  # There is no converter, the init type is the normal type.
+            init_type = self.init_type or self.info[self.name].type
 
+        unannotated = False
         if init_type is None:
-            if ctx.api.options.disallow_untyped_defs:
-                # This is a compromise.  If you don't have a type here then the
-                # __init__ will be untyped. But since the __init__ is added it's
-                # pointing at the decorator. So instead we also show the error in the
-                # assignment, which is where you would fix the issue.
-                node = self.info[self.name].node
-                assert node is not None
-                ctx.api.msg.need_annotation_for_var(node, self.context)
-
+            unannotated = True
             # Convert type not set to Any.
             init_type = AnyType(TypeOfAny.unannotated)
+        else:
+            proper_type = get_proper_type(init_type)
+            if isinstance(proper_type, AnyType):
+                if proper_type.type_of_any == TypeOfAny.unannotated:
+                    unannotated = True
+
+        if unannotated and ctx.api.options.disallow_untyped_defs:
+            # This is a compromise.  If you don't have a type here then the
+            # __init__ will be untyped. But since the __init__ is added it's
+            # pointing at the decorator. So instead we also show the error in the
+            # assignment, which is where you would fix the issue.
+            node = self.info[self.name].node
+            assert node is not None
+            ctx.api.msg.need_annotation_for_var(node, self.context)
 
         if self.kw_only:
             arg_kind = ARG_NAMED_OPT if self.has_default else ARG_NAMED
@@ -154,9 +132,9 @@ def serialize(self) -> JsonDict:
             'has_default': self.has_default,
             'init': self.init,
             'kw_only': self.kw_only,
-            'converter_type': self.converter.type.serialize() if self.converter.type else None,
-            'converter_is_attr_converters_optional': self.converter.is_attr_converters_optional,
-            'converter_is_invalid_converter': self.converter.is_invalid_converter,
+            'has_converter': self.converter is not None,
+            'converter_init_type': self.converter.init_type.serialize()
+            if self.converter and self.converter.init_type else None,
             'context_line': self.context.line,
             'context_column': self.context.column,
             'init_type': self.init_type.serialize() if self.init_type else None,
@@ -169,17 +147,16 @@ def deserialize(cls, info: TypeInfo,
         """Return the Attribute that was serialized."""
         raw_init_type = data['init_type']
         init_type = deserialize_and_fixup_type(raw_init_type, api) if raw_init_type else None
+        raw_converter_init_type = data['converter_init_type']
+        converter_init_type = (deserialize_and_fixup_type(raw_converter_init_type, api)
+                               if raw_converter_init_type else None)
 
-        converter_type = None
-        if data['converter_type']:
-            converter_type = deserialize_and_fixup_type(data['converter_type'], api)
         return Attribute(data['name'],
             info,
             data['has_default'],
             data['init'],
             data['kw_only'],
-            Converter(converter_type, data['converter_is_attr_converters_optional'],
-                      data['converter_is_invalid_converter']),
+            Converter(converter_init_type) if data['has_converter'] else None,
             Context(line=data['context_line'], column=data['context_column']),
             init_type)
 
@@ -542,7 +519,7 @@ def _attribute_from_auto_attrib(ctx: 'mypy.plugin.ClassDefContext',
     has_rhs = not isinstance(rvalue, TempNode)
     sym = ctx.cls.info.names.get(name)
     init_type = sym.type if sym else None
-    return Attribute(name, ctx.cls.info, has_rhs, True, kw_only, Converter(), stmt, init_type)
+    return Attribute(name, ctx.cls.info, has_rhs, True, kw_only, None, stmt, init_type)
 
 
 def _attribute_from_attrib_maker(ctx: 'mypy.plugin.ClassDefContext',
@@ -613,40 +590,76 @@ def _attribute_from_attrib_maker(ctx: 'mypy.plugin.ClassDefContext',
 
 
 def _parse_converter(ctx: 'mypy.plugin.ClassDefContext',
-                     converter: Optional[Expression]) -> Converter:
+                     converter_expr: Optional[Expression]) -> Optional[Converter]:
     """Return the Converter object from an Expression."""
     # TODO: Support complex converters, e.g. lambdas, calls, etc.
-    if converter:
-        if isinstance(converter, RefExpr) and converter.node:
-            if (isinstance(converter.node, FuncDef)
-                    and converter.node.type
-                    and isinstance(converter.node.type, FunctionLike)):
-                return Converter(converter.node.type)
-            elif (isinstance(converter.node, OverloadedFuncDef)
-                    and is_valid_overloaded_converter(converter.node)):
-                return Converter(converter.node.type)
-            elif isinstance(converter.node, TypeInfo):
-                from mypy.checkmember import type_object_type  # To avoid import cycle.
-                return Converter(type_object_type(converter.node, ctx.api.named_type))
-
-        if (isinstance(converter, CallExpr)
-                and isinstance(converter.callee, RefExpr)
-                and converter.callee.fullname in attr_optional_converters
-                and converter.args
-                and converter.args[0]):
-            # Special handling for attr.converters.optional(type)
-            # We extract the type and add make the init_args Optional in Attribute.argument
-            argument = _parse_converter(ctx, converter.args[0])
-            argument.is_attr_converters_optional = True
-            return argument
-
+    if not converter_expr:
+        return None
+    converter_info = Converter()
+    if (isinstance(converter_expr, CallExpr)
+            and isinstance(converter_expr.callee, RefExpr)
+            and converter_expr.callee.fullname in attr_optional_converters
+            and converter_expr.args
+            and converter_expr.args[0]):
+        # Special handling for attr.converters.optional(type)
+        # We extract the type and add make the init_args Optional in Attribute.argument
+        converter_expr = converter_expr.args[0]
+        is_attr_converters_optional = True
+    else:
+        is_attr_converters_optional = False
+
+    converter_type: Optional[Type] = None
+    if isinstance(converter_expr, RefExpr) and converter_expr.node:
+        if isinstance(converter_expr.node, FuncDef):
+            if converter_expr.node.type and isinstance(converter_expr.node.type, FunctionLike):
+                converter_type = converter_expr.node.type
+            else:  # The converter is an unannotated function.
+                converter_info.init_type = AnyType(TypeOfAny.unannotated)
+                return converter_info
+        elif (isinstance(converter_expr.node, OverloadedFuncDef)
+              and is_valid_overloaded_converter(converter_expr.node)):
+            converter_type = converter_expr.node.type
+        elif isinstance(converter_expr.node, TypeInfo):
+            from mypy.checkmember import type_object_type  # To avoid import cycle.
+            converter_type = type_object_type(converter_expr.node, ctx.api.named_type)
+    if isinstance(converter_expr, LambdaExpr):
+        # TODO: should we send a fail if converter_expr.min_args > 1?
+        converter_info.init_type = AnyType(TypeOfAny.unannotated)
+        return converter_info
+
+    if not converter_type:
         # Signal that we have an unsupported converter.
         ctx.api.fail(
-            "Unsupported converter, only named functions and types are currently supported",
-            converter
+            "Unsupported converter, only named functions, types and lambdas are currently "
+            "supported",
+            converter_expr
         )
-        return Converter(None, is_invalid_converter=True)
-    return Converter(None)
+        converter_info.init_type = AnyType(TypeOfAny.from_error)
+        return converter_info
+
+    converter_type = get_proper_type(converter_type)
+    if isinstance(converter_type, CallableType) and converter_type.arg_types:
+        converter_info.init_type = converter_type.arg_types[0]
+    elif isinstance(converter_type, Overloaded):
+        types: List[Type] = []
+        for item in converter_type.items:
+            # Walk the overloads looking for methods that can accept one argument.
+            num_arg_types = len(item.arg_types)
+            if not num_arg_types:
+                continue
+            if num_arg_types > 1 and any(kind == ARG_POS for kind in item.arg_kinds[1:]):
+                continue
+            types.append(item.arg_types[0])
+        # Make a union of all the valid types.
+        if types:
+            converter_info.init_type = make_simplified_union(types)
+
+    if is_attr_converters_optional and converter_info.init_type:
+        # If the converter was attr.converter.optional(type) then add None to
+        # the allowed init_type.
+        converter_info.init_type = UnionType.make_union([converter_info.init_type, NoneType()])
+
+    return converter_info
 
 
 def is_valid_overloaded_converter(defn: OverloadedFuncDef) -> bool:

diff --git a/test-data/unit/check-attr.test b/test-data/unit/check-attr.test
--- a/test-data/unit/check-attr.test
+++ b/test-data/unit/check-attr.test
@@ -878,9 +878,9 @@ def factory(default: int):
    ...
 @attr.s
 class C:
-    x: str = attr.ib(converter=thing.do_it)  # E: Unsupported converter, only named functions and types are currently supported
-    y: str = attr.ib(converter=lambda x: x)  # E: Unsupported converter, only named functions and types are currently supported
-    z: str = attr.ib(converter=factory(8))   # E: Unsupported converter, only named functions and types are currently supported
+    x: str = attr.ib(converter=thing.do_it)  # E: Unsupported converter, only named functions, types and lambdas are currently supported
+    y: str = attr.ib(converter=lambda x: x)
+    z: str = attr.ib(converter=factory(8))   # E: Unsupported converter, only named functions, types and lambdas are currently supported
 reveal_type(C)  # N: Revealed type is "def (x: Any, y: Any, z: Any) -> __main__.C"
 [builtins fixtures/list.pyi]
 
@@ -1731,10 +1731,39 @@ class C:
     name: Union[str, None] = attr.ib(default=None)
     options: Mapping[str, Mapping[str, Any]] = attr.ib(
         default=None, converter=default_if_none(factory=dict) \
-        # E: Unsupported converter, only named functions and types are currently supported
+        # E: Unsupported converter, only named functions, types and lambdas are currently supported
     )
 [builtins fixtures/dict.pyi]
 
+[case testAttrsUnannotatedConverter]
+import attr
+
+def foo(value):
+    return value.split()
+
+@attr.s
+class Bar:
+    field = attr.ib(default=None, converter=foo)
+
+reveal_type(Bar)  # N: Revealed type is "def (field: Any =) -> __main__.Bar"
+bar = Bar("Hello")
+reveal_type(bar.field)  # N: Revealed type is "Any"
+
+[builtins fixtures/tuple.pyi]
+
+[case testAttrsLambdaConverter]
+import attr
+
+@attr.s
+class Bar:
+    name: str = attr.ib(converter=lambda s: s.lower())
+
+reveal_type(Bar)  # N: Revealed type is "def (name: Any) -> __main__.Bar"
+bar = Bar("Hello")
+reveal_type(bar.name)  # N: Revealed type is "builtins.str"
+
+[builtins fixtures/tuple.pyi]
+
 [case testAttrsNestedClass]
 from typing import List
 import attr

"Unsupported converter" for completely unanotated function
A slightly different case with same error message just popped up with mypy==0.650:

```py
import attr


def foo(value):
    return value.split()


@attr.s
class Bar:
    field = attr.ib(default=None, converter=foo)
```

```bash
> mypy test_mypy.py
test_mypy.py:10: error: Unsupported converter, only named functions and types are currently supported
```


Note that adding at least a single annotation to `foo` fixed this. It looks like this should be easy to fix.

cc @euresti 
Having the same issue with lambdas.
How is possible to skip this warning? It appears even in typed functions and it annoys me.
Someone (you?) will have to update the plugin. 
@ilevkivskyi can you demonstrate how I Can add an annotation to suppress this error?
Ah @ilevkivskyi I see you mean this:

```
import attr

def foo(value) -> str:
    return value.split()

@attr.s
class Bar:
    field = attr.ib(default=None, converter=foo)
```
@officialcryptomaster Yes.
Seems like similar issue exists with flake8 which does not go away with type annotations... Any idea how I can work around that one other than suppress it?
@officialcryptomaster this sounds like you should report the issue to flake8, unless I'm misunderstanding what you say.
This is also happening with annotated functions that use [`functools.singledispatch()`](https://docs.python.org/3/library/functools.html#functools.singledispatch).
Maybe the warning should read "Unsupported converter, only types and named functions with an annotated return type are currently supported" 🙂
This somehow seems to be broken for `attrs 20.3`. For 

```python
import attr

def foo(value) -> str:
    return value.split()

@attr.s
class Bar:
    field = attr.ib(default=None, converter=foo)
```

`mypy` gives me ` error: Need type annotation for 'field'`, while it works with `attrs` `19.3`. Not sure if this issue needs to be addressed in `mypy` or `attrs`.

I'm pretty sure this last one is because `attrs` changed the stubs.  
@euresti It still works if one annotates the attribute itself, just was unaware of this possibility, because pycharm issues a misleading warning. 

```python
def foo(value: str) -> List[str]:
    return value.split()


@attr.s
class Bar:
    field: List[str] = attr.ib(default=None, converter=foo)


bar = Bar("5 5")
reveal_type(bar.field) # Revealed type is 'builtins.list[builtins.str]'
```
Hello! Is this still happening? If I can make a contribution, just tell me where to start.
@DiddiLeija: Error message originates from here: https://github.com/python/mypy/blob/master/mypy/plugins/attrs.py#L623
In simple words, we have to provide a friendlier message, right? Or should I move something in the behavior?
I feel like this should just work and infer `Any` as the input type.
@JelleZijlstra : I second this. In my understanding this would make type checking optional.

If functions have annotations, types should be checked. If functions have no annotations, (effectively) no type checking is performed on them.
mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsTypeEquals mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsSimple mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsEqFalse mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsSeriousNames mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsFrozen mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsAnnotated mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsOrderFalse mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsDefaultErrors mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsNextGenFrozen mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsNotBooleans mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsCmpEqOrderValues mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsPython2Annotations mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsNextGenDetect mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsInheritance mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsInitFalse mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsAutoAttribs mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsNewPackage mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsNestedInClasses mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsInitAttribFalse mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsUntypedNoUntypedDefs mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsDataClass mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsInheritanceOverride mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsCmpTrue mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsTypeAlias mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsWrongReturnValue mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsOtherOverloads mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsMultiGenericInheritance mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsGeneric mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsUsingConvert mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsGenericClassmethod mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsDefaultDecorator mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsUntypedGenericInheritance mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsUsingConverter mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsValidatorDecorator mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsForwardReference mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsGenericInheritance mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsUsingConvertAndConverter mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsLocalVariablesInClassMethod mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsForwardReferenceInClass mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsGenericInheritance2 mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsUsingBadConverter mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsUnionForward mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsImporting mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsGenericInheritance3 mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsUsingBadConverterReprocess mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsOtherMethods mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsMultiAssign mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsRepeatedName mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsCallableAttributes mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsMultiAssign2 mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsUsingConverterAndSubclass mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsWithFactory mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsNewStyleClassPy2 mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsPrivateInit mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsUsingConverterWithTypes mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsFactoryAndDefault mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsAutoAttribsPy2 mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsAutoMustBeAll mypy/test/testcheck.py::TypeCheckSuite::check-attr.test::testAttrsFactoryBadReturn 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