diff --git a/ablate/sources/__init__.py b/ablate/sources/__init__.py
new file mode 100644
index 0000000..8a9496e
--- /dev/null
+++ b/ablate/sources/__init__.py
@@ -0,0 +1,5 @@
+from .abstract_source import AbstractSource
+from .mlflow_source import MLflow
+
+
+__all__ = ["AbstractSource", "MLflow"]
diff --git a/ablate/sources/abstract_source.py b/ablate/sources/abstract_source.py
new file mode 100644
index 0000000..c1be956
--- /dev/null
+++ b/ablate/sources/abstract_source.py
@@ -0,0 +1,14 @@
+from abc import ABC, abstractmethod
+from typing import List
+
+from ablate.core.types import Run
+
+
+class AbstractSource(ABC):
+    @abstractmethod
+    def load(self) -> List[Run]:
+        """Load the data from the source.
+
+        Returns:
+            A list of runs with their parameters, metrics, and optionally temporal data.
+        """
diff --git a/ablate/sources/mlflow_source.py b/ablate/sources/mlflow_source.py
new file mode 100644
index 0000000..41c3362
--- /dev/null
+++ b/ablate/sources/mlflow_source.py
@@ -0,0 +1,57 @@
+from pathlib import Path
+from typing import List
+from urllib.parse import urlparse
+
+from ablate.core.types import Run
+
+from .abstract_source import AbstractSource
+
+
+class MLflow(AbstractSource):
+    def __init__(self, experiment_names: List[str], tracking_uri: str | None) -> None:
+        """MLflow source for loading runs from a MLflow server.
+
+        Args:
+            experiment_names: A list of experiment names to load runs from.
+            tracking_uri: The URI or local path to the MLflow tracking server.
+                If None, use the default tracking URI set in the MLflow configuration.
+                Defaults to None.
+
+        Raises:
+            ImportError: If the `mlflow` package is not installed.
+        """
+        try:
+            from mlflow.tracking import MlflowClient
+        except ImportError as e:
+            raise ImportError(
+                "MLflow source requires `mlflow`. "
+                "Please install with `pip install ablate[mlflow]`."
+            ) from e
+
+        self.tracking_uri = tracking_uri
+        self.experiment_names = experiment_names
+        if not tracking_uri:
+            self.client = MlflowClient()
+            return
+        if urlparse(tracking_uri).scheme in {"http", "https", "file"}:
+            uri = tracking_uri
+        else:
+            uri = Path(tracking_uri).resolve().as_uri()
+        self.client = MlflowClient(uri)
+
+    def load(self) -> List[Run]:
+        runs = self.client.search_runs(
+            [
+                self.client.get_experiment_by_name(n).experiment_id
+                for n in self.experiment_names
+            ]
+        )
+        records: List[Run] = []
+        for run in runs:
+            p, m, t = run.data.params, run.data.metrics, {}
+            p.update(run.data.tags)
+            for name in m:
+                history = self.client.get_metric_history(run.info.run_id, name)
+                t[name] = [(h.step, h.value) for h in history]
+            records.append(Run(id=run.info.run_id, params=p, metrics=m, temporal=t))
+        return records
diff --git a/tests/sources/test_mlflow_source.py b/tests/sources/test_mlflow_source.py
new file mode 100644
index 0000000..5821999
--- /dev/null
+++ b/tests/sources/test_mlflow_source.py
@@ -0,0 +1,62 @@
+from types import SimpleNamespace
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from ablate.sources import MLflow
+
+
+@pytest.mark.filterwarnings("ignore::pydantic.PydanticDeprecatedSince20")
+@pytest.mark.parametrize(
+    ("tracking_uri", "expected_uri_startswith"),
+    [
+        (None, None),
+        ("/some/local/path", "file://"),
+        ("http://mlflow.mycompany.com", "http://"),
+        ("https://mlflow.mycompany.com", "https://"),
+        ("file:///already/uri", "file://"),
+    ],
+)
+@patch("mlflow.tracking.MlflowClient")
+def test_mlflow_uri_resolution(
+    client: MagicMock,
+    tracking_uri: str,
+    expected_uri_startswith: str,
+) -> None:
+    mock_client = client.return_value
+    mock_run = SimpleNamespace(
+        info=SimpleNamespace(run_id="run-1"),
+        data=SimpleNamespace(
+            params={"lr": "0.01"},
+            metrics={"accuracy": 0.9},
+            tags={"mlflow.runName": "example"},
+        ),
+    )
+    mock_client.get_experiment_by_name.return_value = SimpleNamespace(
+        experiment_id="123"
+    )
+    mock_client.search_runs.return_value = [mock_run]
+    mock_client.get_metric_history.return_value = [SimpleNamespace(step=1, value=0.9)]
+
+    source = MLflow(tracking_uri=tracking_uri, experiment_names=["default"])
+    runs = source.load()
+
+    if expected_uri_startswith is None:
+        client.assert_called_once_with()
+    else:
+        uri_arg = client.call_args.args[0]
+        assert uri_arg.startswith(expected_uri_startswith)
+
+    r = runs[0]
+    assert r.id == "run-1"
+    assert r.params == {"lr": "0.01", "mlflow.runName": "example"}
+    assert r.metrics == {"accuracy": 0.9}
+    assert r.temporal == {"accuracy": [(1, 0.9)]}
+
+
+def test_import_error_if_mlflow_not_installed() -> None:
+    with (
+        patch.dict("sys.modules", {"mlflow.tracking": None}),
+        pytest.raises(ImportError, match="MLflow source requires `mlflow`"),
+    ):
+        MLflow(tracking_uri="/fake", experiment_names=["exp"])