diff --git a/lmms_eval/models/__init__.py b/lmms_eval/models/__init__.py
index a7c1f92e5..25d71a3b4 100644
--- a/lmms_eval/models/__init__.py
+++ b/lmms_eval/models/__init__.py
@@ -114,6 +114,7 @@
 
 AVAILABLE_CHAT_TEMPLATE_MODELS = {
     "bagel_lmms_engine": "BagelLmmsEngine",
+    "ollama": "Ollama",
     "fastvideo": "FastVideo",
     "internvl_hf": "InternVLHf",
     "llava_hf": "LlavaHf",
diff --git a/lmms_eval/models/chat/ollama.py b/lmms_eval/models/chat/ollama.py
new file mode 100644
index 000000000..ae8ef86d3
--- /dev/null
+++ b/lmms_eval/models/chat/ollama.py
@@ -0,0 +1,64 @@
+"""Ollama chat backend.
+
+Ollama exposes an OpenAI-compatible API at http://localhost:11434/v1, so this
+backend inherits the OpenAI chat implementation for generation.
+
+Example usage::
+
+    python -m lmms_eval \\
+        --model ollama \\
+        --model_args model_version=llava \\
+        --tasks mme --limit 8
+"""
+
+from __future__ import annotations
+
+from typing import Any, List, Optional, Tuple
+
+from lmms_eval.api.instance import Instance
+from lmms_eval.api.registry import register_model
+from lmms_eval.models.chat.openai import OpenAICompatible as OpenAICompatibleChatBase
+
+_OLLAMA_DEFAULT_BASE_URL = "http://localhost:11434/v1"
+_OLLAMA_NO_KEY = "ollama"
+
+
+@register_model("ollama")
+class Ollama(OpenAICompatibleChatBase):
+    """Ollama local inference backend (OpenAI-compatible /v1 API)."""
+
+    is_simple = False
+
+    def __init__(
+        self,
+        model_version: str = "llava",
+        model: Optional[str] = None,
+        host: str = _OLLAMA_DEFAULT_BASE_URL,
+        base_url: Optional[str] = None,
+        api_key: str = _OLLAMA_NO_KEY,
+        num_concurrent: int = 4,
+        **kwargs: Any,
+    ) -> None:
+        resolved_base_url = base_url or host
+        # Derive the Ollama native API root (without /v1) for loglikelihood calls.
+        self._ollama_api_base = resolved_base_url.rstrip("/").removesuffix("/v1")
+        super().__init__(
+            model_version=model_version,
+            model=model,
+            base_url=resolved_base_url,
+            api_key=api_key,
+            num_concurrent=num_concurrent,
+            azure_openai=False,
+            **kwargs,
+        )
+
+    def loglikelihood(self, requests: List[Instance]) -> List[Tuple[float, bool]]:
+        """Ollama does not expose prompt-token log-likelihoods.
+
+        Ollama's native ``POST /api/generate`` can return ``logprobs`` for
+        generated tokens, but lmms-eval's loglikelihood API needs the
+        likelihood of a provided continuation under a fixed context. Returning
+        a fabricated score would make multiple-choice likelihood tasks look
+        valid while producing misleading metrics.
+        """
+        raise NotImplementedError("Ollama loglikelihood is not supported; use generate_until tasks instead.")
diff --git a/test/models/test_ollama.py b/test/models/test_ollama.py
new file mode 100644
index 000000000..c20d39ea1
--- /dev/null
+++ b/test/models/test_ollama.py
@@ -0,0 +1,90 @@
+"""Unit tests for the Ollama backend."""
+
+from __future__ import annotations
+
+import sys
+import types
+import unittest
+from types import SimpleNamespace
+from unittest import mock
+
+
+def _ensure_decord_stub() -> None:
+    """Register a fake decord module so optional_import resolves without the package."""
+    if "decord" not in sys.modules:
+        mod = types.ModuleType("decord")
+        mod.VideoReader = mock.MagicMock()
+        mod.cpu = mock.MagicMock()
+        sys.modules["decord"] = mod
+
+
+def _fake_accelerator() -> mock.MagicMock:
+    acc = mock.MagicMock()
+    acc.num_processes = 1
+    acc.local_process_index = 0
+    acc.device = "cpu"
+    return acc
+
+
+def _make_ollama(model_version: str = "llava", **kwargs):
+    _ensure_decord_stub()
+    from lmms_eval.models.chat.ollama import Ollama
+
+    with mock.patch("lmms_eval.models.simple.openai.OpenAI"), mock.patch("lmms_eval.models.simple.openai.Accelerator", return_value=_fake_accelerator()):
+        return Ollama(model_version=model_version, **kwargs)
+
+
+def _make_instance(context: str, continuation: str) -> SimpleNamespace:
+    return SimpleNamespace(args=(context, continuation), rank=0)
+
+
+# ---------------------------------------------------------------------------
+# Tests
+# ---------------------------------------------------------------------------
+
+
+class TestOllamaRegistration(unittest.TestCase):
+    def test_registered_as_chat_model(self) -> None:
+        from lmms_eval.models import MODEL_REGISTRY_V2
+
+        manifest = MODEL_REGISTRY_V2.get_manifest("ollama")
+        self.assertEqual(manifest.model_id, "ollama")
+        self.assertEqual(manifest.chat_class_path, "lmms_eval.models.chat.ollama.Ollama")
+        self.assertIsNone(manifest.simple_class_path)
+
+    def test_is_simple_false(self) -> None:
+        _ensure_decord_stub()
+        from lmms_eval.models.chat.ollama import Ollama
+
+        self.assertFalse(Ollama.is_simple)
+
+
+class TestOllamaInit(unittest.TestCase):
+    def test_default_base_url(self) -> None:
+        m = _make_ollama()
+        self.assertEqual(m._ollama_api_base, "http://localhost:11434")
+
+    def test_custom_host_strips_v1(self) -> None:
+        m = _make_ollama(host="http://myserver:11434/v1")
+        self.assertEqual(m._ollama_api_base, "http://myserver:11434")
+
+    def test_model_version_stored(self) -> None:
+        m = _make_ollama(model_version="mistral")
+        self.assertEqual(m.model_version, "mistral")
+
+    def test_num_concurrent_default(self) -> None:
+        m = _make_ollama()
+        self.assertEqual(m.num_concurrent, 4)
+
+
+class TestOllamaLoglikelihood(unittest.TestCase):
+    def test_loglikelihood_is_explicitly_unsupported(self) -> None:
+        model = _make_ollama()
+        instance = _make_instance("The sky is", " blue")
+
+        with self.assertRaisesRegex(NotImplementedError, "generate_until"):
+            model.loglikelihood([instance])
+
+
+if __name__ == "__main__":
+    unittest.main()