diff --git a/typesystem/fields.py b/typesystem/fields.py
index 90716ef..266177c 100644
--- a/typesystem/fields.py
+++ b/typesystem/fields.py
@@ -63,6 +63,12 @@ class Field:
     def has_default(self) -> bool:
         return hasattr(self, "default")
 
+    def get_default_value(self) -> typing.Any:
+        default = getattr(self, "default", None)
+        if callable(default):
+            return default()
+        return default
+
     def error(self, code: str) -> ValidationError:
         text = self.errors[code].format(**self.__dict__)
         return ValidationError(text=text, code=code)
@@ -423,7 +429,7 @@ class Object(Field):
         for key, child_schema in self.properties.items():
             if key not in value:
                 if child_schema.has_default():
-                    validated[key] = child_schema.default
+                    validated[key] = child_schema.get_default_value()
                 continue
             item = value[key]
             child_value, error = child_schema.validate(item, strict=strict)
diff --git a/typesystem/schemas.py b/typesystem/schemas.py
index 6cb847c..fe2f873 100644
--- a/typesystem/schemas.py
+++ b/typesystem/schemas.py
@@ -68,7 +68,7 @@ class Schema(Mapping, metaclass=SchemaMetaclass):
                     raise TypeError(message)
                 setattr(self, key, value)
             elif schema.has_default():
-                setattr(self, key, schema.default)
+                setattr(self, key, schema.get_default_value())
 
         if kwargs:
             key = list(kwargs.keys())[0]

Callable defaults
Eg.

```python
class Something(typesystem.Schema):
    created = typesystem.DateTime(default=datetime.datetime.now)
    ...
```
diff --git a/tests/test_schemas.py b/tests/test_schemas.py
index c4e2ecc..202af7b 100644
--- a/tests/test_schemas.py
+++ b/tests/test_schemas.py
@@ -125,3 +125,12 @@ def test_schema_decimal_serialization():
 
     assert item.price == decimal.Decimal("123.45")
     assert item["price"] == 123.45
+
+
+def test_schema_with_callable_default():
+    class Example(typesystem.Schema):
+        created = typesystem.Date(default=datetime.date.today)
+
+    value, error = Example.validate({})
+    print(value)
+    assert value.created == datetime.date.today()

pip install -e .[dev]
parse_log_pytest
requirements.txt
pytest pytest-cov mypy
apt-get update apt-get install -y gcc
3.6
requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
attrs==22.2.0
autoflake==1.4
black==22.8.0
certifi==2021.5.30
charset-normalizer==2.0.12
click==8.0.4
codecov==2.1.13
coverage==6.2
dataclasses==0.8
idna==3.10
importlib-metadata==4.8.3
iniconfig==1.1.1
isort==5.10.1
Jinja2==3.0.3
MarkupSafe==2.0.1
mypy==0.971
mypy-extensions==1.0.0
packaging==21.3
pathspec==0.9.0
platformdirs==2.4.0
pluggy==1.0.0
py==1.11.0
pyflakes==3.0.1
pyparsing==3.1.4
pytest==7.0.1
pytest-cov==4.0.0
requests==2.27.1
tomli==1.2.3
typed-ast==1.5.5
-e git+https://github.com/encode/typesystem.git@2fcc6daebd0193a02d135daee4564f0e219e95ed#egg=typesystem
typing_extensions==4.1.1
urllib3==1.26.20
zipp==3.6.0

name: typesystem
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - certifi=2021.5.30=py36h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.3=he6710b0_2
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=1.1.1w=h7f8727e_0
  - pip=21.2.2=py36h06a4308_0
  - python=3.6.13=h12debd9_1
  - readline=8.2=h5eee18b_0
  - setuptools=58.0.4=py36h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - wheel=0.37.1=pyhd3eb1b0_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - attrs==22.2.0
      - autoflake==1.4
      - black==22.8.0
      - charset-normalizer==2.0.12
      - click==8.0.4
      - codecov==2.1.13
      - coverage==6.2
      - dataclasses==0.8
      - idna==3.10
      - importlib-metadata==4.8.3
      - iniconfig==1.1.1
      - isort==5.10.1
      - jinja2==3.0.3
      - markupsafe==2.0.1
      - mypy==0.971
      - mypy-extensions==1.0.0
      - packaging==21.3
      - pathspec==0.9.0
      - platformdirs==2.4.0
      - pluggy==1.0.0
      - py==1.11.0
      - pyflakes==3.0.1
      - pyparsing==3.1.4
      - pytest==7.0.1
      - pytest-cov==4.0.0
      - requests==2.27.1
      - tomli==1.2.3
      - typed-ast==1.5.5
      - typing-extensions==4.1.1
      - urllib3==1.26.20
      - zipp==3.6.0
prefix: /opt/conda/envs/typesystem

tests/test_schemas.py::test_schema_with_callable_default
tests/test_schemas.py::test_schema_validation tests/test_schemas.py::test_schema_eq tests/test_schemas.py::test_schema_repr tests/test_schemas.py::test_schema_instantiation tests/test_schemas.py::test_schema_subclass tests/test_schemas.py::test_schema_serialization tests/test_schemas.py::test_schema_len tests/test_schemas.py::test_schema_getattr tests/test_schemas.py::test_schema_missing_getattr tests/test_schemas.py::test_schema_format_serialization tests/test_schemas.py::test_schema_decimal_serialization
typesystem/schemas.py typesystem/fields.py
typesystem/schemas.py typesystem/fields.py