diff --git a/tests/test_meldingen/__init__.py b/meldingen_core/actions/__init__.py
similarity index 100%
rename from tests/test_meldingen/__init__.py
rename to meldingen_core/actions/__init__.py
diff --git a/meldingen_core/actions.py b/meldingen_core/actions/melding.py
similarity index 100%
rename from meldingen_core/actions.py
rename to meldingen_core/actions/melding.py
diff --git a/meldingen_core/actions/user.py b/meldingen_core/actions/user.py
new file mode 100644
index 0000000..299ab13
--- /dev/null
+++ b/meldingen_core/actions/user.py
@@ -0,0 +1,52 @@
+from collections.abc import Collection
+
+from meldingen_core.models import User
+from meldingen_core.repositories import BaseUserRepository
+
+
+class UserCreateAction:
+    """Action that stores a user."""
+
+    repository: BaseUserRepository
+
+    def __init__(self, repository: BaseUserRepository):
+        self.repository = repository
+
+    async def __call__(self, user: User) -> None:
+        await self.repository.add(user)
+
+
+class UserListAction:
+    """Action that retrieves a list of users."""
+
+    repository: BaseUserRepository
+
+    def __init__(self, repository: BaseUserRepository):
+        self.repository = repository
+
+    async def __call__(self, *, limit: int | None = None, offset: int | None = None) -> Collection[User]:
+        return await self.repository.list(limit=limit, offset=offset)
+
+
+class UserRetrieveAction:
+    """Action that retrieves a user."""
+
+    repository: BaseUserRepository
+
+    def __init__(self, repository: BaseUserRepository):
+        self.repository = repository
+
+    async def __call__(self, pk: int) -> User | None:
+        return await self.repository.retrieve(pk=pk)
+
+
+class UserDeleteAction:
+    """Action that deletes a user."""
+
+    repository: BaseUserRepository
+
+    def __init__(self, repository: BaseUserRepository):
+        self.repository = repository
+
+    async def __call__(self, pk: int) -> None:
+        await self.repository.delete(pk=pk)
diff --git a/meldingen_core/models.py b/meldingen_core/models.py
index 7ce5def..c19abbc 100644
--- a/meldingen_core/models.py
+++ b/meldingen_core/models.py
@@ -2,3 +2,10 @@ class Melding:
     """This is the base model for a 'melding'."""
 
     text: str
+
+
+class User:
+    """This is the base model for a 'user'."""
+
+    username: str
+    email: str
diff --git a/meldingen_core/repositories.py b/meldingen_core/repositories.py
index 87e9564..03cca53 100644
--- a/meldingen_core/repositories.py
+++ b/meldingen_core/repositories.py
@@ -2,7 +2,7 @@
 from collections.abc import Collection
 from typing import Generic, TypeVar
 
-from meldingen_core.models import Melding
+from meldingen_core.models import Melding, User
 
 T = TypeVar("T")
 T_co = TypeVar("T_co", covariant=True)
@@ -21,6 +21,13 @@ async def list(self, *, limit: int | None = None, offset: int | None = None) ->
     async def retrieve(self, pk: int) -> T_co | None:
         ...
 
+    async def delete(self, pk: int) -> None:
+        raise NotImplemented
+
 
 class BaseMeldingRepository(BaseRepository[Melding, Melding], metaclass=ABCMeta):
     """Repository for Melding."""
+
+
+class BaseUserRepository(BaseRepository[User, User], metaclass=ABCMeta):
+    """Repository for User."""
diff --git a/tests/test_actions/__init__.py b/tests/test_actions/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_meldingen/test_actions.py b/tests/test_actions/test_melding_actions.py
similarity index 97%
rename from tests/test_meldingen/test_actions.py
rename to tests/test_actions/test_melding_actions.py
index 8a0ccfd..3a3a484 100644
--- a/tests/test_meldingen/test_actions.py
+++ b/tests/test_actions/test_melding_actions.py
@@ -1,7 +1,7 @@
 import pytest
 import pytest_asyncio
 
-from meldingen_core.actions import MeldingCreateAction, MeldingListAction, MeldingRetrieveAction
+from meldingen_core.actions.melding import MeldingCreateAction, MeldingListAction, MeldingRetrieveAction
 from meldingen_core.models import Melding
 from meldingen_core.repositories import BaseMeldingRepository
 
diff --git a/tests/test_actions/test_user_actions.py b/tests/test_actions/test_user_actions.py
new file mode 100644
index 0000000..2f9d85f
--- /dev/null
+++ b/tests/test_actions/test_user_actions.py
@@ -0,0 +1,195 @@
+import pytest
+import pytest_asyncio
+
+from meldingen_core.actions.user import UserCreateAction, UserDeleteAction, UserListAction, UserRetrieveAction
+from meldingen_core.models import User
+from meldingen_core.repositories import BaseUserRepository
+
+# Fixtures
+
+
+@pytest.fixture
+def unpopulated_users_repository() -> BaseUserRepository:
+    class TestUserRepository(BaseUserRepository):
+        data: list[User]
+
+        def __init__(self) -> None:
+            self.data = []
+
+        async def add(self, user: User) -> None:
+            self.data.append(user)
+
+        async def list(self, *, limit: int | None = None, offset: int | None = None) -> list[User]:
+            if limit and offset:
+                return self.data[offset : offset + limit]
+            elif limit and not offset:
+                return self.data[:limit]
+            elif not limit and offset:
+                return self.data[offset:]
+            else:
+                return self.data
+
+        async def retrieve(self, pk: int) -> User | None:
+            for _user in self.data:
+                if _user.username == str(pk):
+                    return _user
+            return None
+
+        async def find_by_email(self, email: str) -> User | None:
+            for _user in self.data:
+                if _user.email == email:
+                    return _user
+            return None
+
+        async def delete(self, pk: int) -> None:
+            for _user in self.data[:]:
+                if _user.username == str(pk):
+                    self.data.remove(_user)
+            return None
+
+    repository = TestUserRepository()
+    return repository
+
+
+@pytest_asyncio.fixture
+async def populated_users_repository(
+    unpopulated_users_repository: BaseUserRepository,
+) -> BaseUserRepository:
+    for _pk in range(10):
+        user = User()
+        user.username = f"{_pk}"
+        user.email = f"user-{_pk}@example.com"
+        await unpopulated_users_repository.add(user)
+
+    return unpopulated_users_repository
+
+
+@pytest.fixture
+def users_create_action(
+    unpopulated_users_repository: BaseUserRepository,
+) -> UserCreateAction:
+    return UserCreateAction(unpopulated_users_repository)
+
+
+@pytest.fixture
+def users_list_action(
+    populated_users_repository: BaseUserRepository,
+) -> UserListAction:
+    return UserListAction(populated_users_repository)
+
+
+@pytest.fixture
+def users_retrieve_action(
+    populated_users_repository: BaseUserRepository,
+) -> UserRetrieveAction:
+    return UserRetrieveAction(populated_users_repository)
+
+
+@pytest.fixture
+def users_delete_action(
+    populated_users_repository: BaseUserRepository,
+) -> UserDeleteAction:
+    return UserDeleteAction(populated_users_repository)
+
+
+# PyTest Classes
+
+
+class TestUserCreateAction:
+    @pytest.mark.asyncio
+    async def test_add(self, users_create_action: UserCreateAction) -> None:
+        assert len(await users_create_action.repository.list()) == 0
+
+        user = User()
+        user.username = "1"
+
+        await users_create_action(user)
+
+        assert len(await users_create_action.repository.list()) == 1
+        assert await users_create_action.repository.retrieve(pk=1) == user
+
+
+class TestUserListAction:
+    @pytest.mark.asyncio
+    async def test_list_all(self, users_list_action: UserListAction) -> None:
+        users = await users_list_action()
+
+        assert len(users) == 10
+
+    @pytest.mark.parametrize(
+        "limit, expected_result",
+        [(1, 1), (5, 5), (10, 10), (20, 10)],
+    )
+    @pytest.mark.asyncio
+    async def test_list_limit(self, users_list_action: UserListAction, limit: int, expected_result: int) -> None:
+        users = await users_list_action(limit=limit)
+
+        assert len(users) == expected_result
+
+    @pytest.mark.parametrize("offset, expected_result", [(1, 9), (5, 5), (10, 0), (20, 0)])
+    @pytest.mark.asyncio
+    async def test_list_offset(
+        self,
+        users_list_action: UserListAction,
+        offset: int,
+        expected_result: int,
+    ) -> None:
+        users = await users_list_action(offset=offset)
+
+        assert len(users) == expected_result
+
+    @pytest.mark.parametrize(
+        "limit, offset, expected_result",
+        [(10, 0, 10), (5, 0, 5), (10, 10, 0), (20, 0, 10)],
+    )
+    @pytest.mark.asyncio
+    async def test_list_limit_offset(
+        self,
+        users_list_action: UserListAction,
+        limit: int,
+        offset: int,
+        expected_result: int,
+    ) -> None:
+        users = await users_list_action(limit=limit, offset=offset)
+
+        assert len(users) == expected_result
+
+
+class TestUserRetrieveAction:
+    @pytest.mark.parametrize("pk", [1, 2, 3, 4, 5])
+    @pytest.mark.asyncio
+    async def test_retrieve_existing_users(self, users_retrieve_action: UserRetrieveAction, pk: int) -> None:
+        user = await users_retrieve_action(pk=pk)
+
+        assert user is not None
+        assert user.username == str(pk)
+
+    @pytest.mark.parametrize("pk", [101, 102, 103, 104, 105])
+    @pytest.mark.asyncio
+    async def test_retrieve_non_existing_users(self, users_retrieve_action: UserRetrieveAction, pk: int) -> None:
+        user = await users_retrieve_action(pk=pk)
+
+        assert user is None
+
+
+class TestUserDeleteAction:
+    @pytest.mark.parametrize("pk", [1, 2, 3, 4, 5])
+    @pytest.mark.asyncio
+    async def test_delete_existing_user(self, users_delete_action: UserDeleteAction, pk: int) -> None:
+        assert await users_delete_action.repository.retrieve(pk=pk) is not None
+        assert len(await users_delete_action.repository.list()) == 10
+
+        await users_delete_action(pk=pk)
+
+        assert await users_delete_action.repository.retrieve(pk=pk) is None
+        assert len(await users_delete_action.repository.list()) == 9
+
+    @pytest.mark.parametrize("pk", [101, 102, 103, 104, 105])
+    @pytest.mark.asyncio
+    async def test_delete_non_existing_user(self, users_delete_action: UserDeleteAction, pk: int) -> None:
+        assert await users_delete_action.repository.retrieve(pk=pk) is None
+        assert len(await users_delete_action.repository.list()) == 10
+
+        await users_delete_action(pk=pk)
+
+        assert len(await users_delete_action.repository.list()) == 10