diff --git a/hcloud/core/domain.py b/hcloud/core/domain.py
index 30c2d3e..65b7ffe 100644
--- a/hcloud/core/domain.py
+++ b/hcloud/core/domain.py
@@ -1,5 +1,10 @@
 from __future__ import annotations
 
+from datetime import datetime
+from typing import Any
+
+from .client import BoundModelBase
+
 
 class BaseDomain:
     __slots__: tuple[str, ...] = ()
@@ -12,11 +17,34 @@ def from_dict(cls, data: dict):  # type: ignore[no-untyped-def]
         supported_data = {k: v for k, v in data.items() if k in cls.__slots__}
         return cls(**supported_data)
 
+    def to_dict(self) -> dict:
+        """Recursively convert a domain object to a dict."""
+        return _make_serializable(self)  # type: ignore
+
     def __repr__(self) -> str:
         kwargs = [f"{key}={getattr(self, key)!r}" for key in self.__slots__]
         return f"{self.__class__.__qualname__}({', '.join(kwargs)})"
 
 
+def _make_serializable(value: Any) -> dict | list | str | int | float:
+    if isinstance(value, (BaseDomain, BoundModelBase)):
+        if isinstance(value, BoundModelBase):
+            value = value.data_model
+
+        return {key: _make_serializable(getattr(value, key)) for key in value.__slots__}
+
+    if isinstance(value, dict):
+        return {key: _make_serializable(value[key]) for key in value}
+
+    if isinstance(value, list):
+        return [_make_serializable(child) for child in value]
+
+    if isinstance(value, datetime):
+        return value.isoformat()
+
+    return value
+
+
 class DomainIdentityMixin:
     __slots__ = ()
 
diff --git a/tests/unit/core/conftest.py b/tests/unit/core/conftest.py
new file mode 100644
index 0000000..5919e0d
--- /dev/null
+++ b/tests/unit/core/conftest.py
@@ -0,0 +1,193 @@
+from __future__ import annotations
+
+import pytest
+
+
+@pytest.fixture()
+def server_dict():
+    return {
+        "id": 35555937,
+        "name": "tmp",
+        "status": "running",
+        "created": "2023-08-03T13:06:14+00:00",
+        "public_net": {
+            "ipv4": {
+                "ip": "95.217.11.207",
+                "blocked": False,
+                "dns_ptr": "static.207.11.217.95.clients.your-server.de",
+                "id": 36311011,
+            },
+            "ipv6": {
+                "ip": "2a01:4f9:c012:63c9::/64",
+                "blocked": False,
+                "dns_ptr": [],
+                "id": 36311012,
+            },
+            "floating_ips": [],
+            "firewalls": [],
+        },
+        "private_net": [],
+        "server_type": {
+            "id": 1,
+            "name": "cx11",
+            "description": "CX11",
+            "cores": 1,
+            "memory": 2.0,
+            "disk": 20,
+            "deprecated": False,
+            "prices": [
+                {
+                    "location": "fsn1",
+                    "price_hourly": {
+                        "net": "0.0052000000",
+                        "gross": "0.0061880000000000",
+                    },
+                    "price_monthly": {
+                        "net": "3.2900000000",
+                        "gross": "3.9151000000000000",
+                    },
+                },
+                {
+                    "location": "hel1",
+                    "price_hourly": {
+                        "net": "0.0052000000",
+                        "gross": "0.0061880000000000",
+                    },
+                    "price_monthly": {
+                        "net": "3.2900000000",
+                        "gross": "3.9151000000000000",
+                    },
+                },
+                {
+                    "location": "nbg1",
+                    "price_hourly": {
+                        "net": "0.0052000000",
+                        "gross": "0.0061880000000000",
+                    },
+                    "price_monthly": {
+                        "net": "3.2900000000",
+                        "gross": "3.9151000000000000",
+                    },
+                },
+            ],
+            "storage_type": "local",
+            "cpu_type": "shared",
+            "architecture": "x86",
+            "included_traffic": 21990232555520,
+            "deprecation": None,
+        },
+        "datacenter": {
+            "id": 3,
+            "name": "hel1-dc2",
+            "description": "Helsinki 1 virtual DC 2",
+            "location": {
+                "id": 3,
+                "name": "hel1",
+                "description": "Helsinki DC Park 1",
+                "country": "FI",
+                "city": "Helsinki",
+                "latitude": 60.169855,
+                "longitude": 24.938379,
+                "network_zone": "eu-central",
+            },
+            "server_types": {
+                "supported": [
+                    1,
+                    3,
+                    5,
+                    7,
+                    9,
+                    22,
+                    23,
+                    24,
+                    25,
+                    26,
+                    33,
+                    34,
+                    35,
+                    36,
+                    37,
+                    38,
+                    45,
+                    93,
+                    94,
+                    95,
+                ],
+                "available": [
+                    1,
+                    3,
+                    5,
+                    7,
+                    9,
+                    22,
+                    23,
+                    24,
+                    25,
+                    26,
+                    33,
+                    34,
+                    35,
+                    36,
+                    37,
+                    38,
+                ],
+                "available_for_migration": [
+                    1,
+                    3,
+                    5,
+                    7,
+                    9,
+                    22,
+                    23,
+                    24,
+                    25,
+                    26,
+                    33,
+                    34,
+                    35,
+                    36,
+                    37,
+                    38,
+                    96,
+                    97,
+                    98,
+                    99,
+                    100,
+                    101,
+                ],
+            },
+        },
+        "image": {
+            "id": 114690387,
+            "type": "system",
+            "status": "available",
+            "name": "debian-12",
+            "description": "Debian 12",
+            "image_size": None,
+            "disk_size": 5,
+            "created": "2023-06-13T06:00:02+00:00",
+            "created_from": None,
+            "bound_to": None,
+            "os_flavor": "debian",
+            "os_version": "12",
+            "rapid_deploy": True,
+            "protection": {"delete": False},
+            "deprecated": None,
+            "labels": {},
+            "deleted": None,
+            "architecture": "x86",
+        },
+        "iso": None,
+        "rescue_enabled": False,
+        "locked": False,
+        "backup_window": None,
+        "outgoing_traffic": None,
+        "ingoing_traffic": None,
+        "included_traffic": 21990232555520,
+        "protection": {"delete": False, "rebuild": False},
+        "labels": {},
+        "volumes": [],
+        # "load_balancers": [],
+        "primary_disk_size": 20,
+        "placement_group": None,
+    }
diff --git a/tests/unit/core/test_domain.py b/tests/unit/core/test_domain.py
index 456b3bb..9c7adf5 100644
--- a/tests/unit/core/test_domain.py
+++ b/tests/unit/core/test_domain.py
@@ -119,6 +119,44 @@ def test_from_dict_ok(self, data_dict, expected_result):
         for k, v in expected_result.items():
             assert getattr(model, k) == v
 
+    @pytest.mark.parametrize(
+        "data,expected",
+        [
+            (
+                SomeOtherDomain(id=1, name="name1"),
+                {"id": 1, "name": "name1", "child": None},
+            ),
+            (
+                SomeOtherDomain(
+                    id=2, name="name2", child=SomeOtherDomain(id=3, name="name3")
+                ),
+                {
+                    "id": 2,
+                    "name": "name2",
+                    "child": {"id": 3, "name": "name3", "child": None},
+                },
+            ),
+            (
+                SomeOtherDomain(
+                    id=2, name="name2", child=[SomeOtherDomain(id=3, name="name3")]
+                ),
+                {
+                    "id": 2,
+                    "name": "name2",
+                    "child": [{"id": 3, "name": "name3", "child": None}],
+                },
+            ),
+        ],
+    )
+    def test_to_dict_ok(self, data, expected):
+        assert data.to_dict() == expected
+
+    def test_from_dict_and_to_dict_ok(self, server_dict: dict):
+        from hcloud.servers import Server
+
+        server = Server.from_dict(server_dict)
+        assert server.to_dict() == server_dict
+
     @pytest.mark.parametrize(
         "data,expected",
         [