diff --git a/README.md b/README.md
index bc44295..dc690a3 100644
--- a/README.md
+++ b/README.md
@@ -67,3 +67,4 @@ Results are saved to `outputs/{dataset}/{memory}/{mode}/{domain}.json` and can b
 - Python ≥ 3.11
 - `GEMINI_API_KEY` in `.env` or environment
 - For MemBench: set `MEMBENCH_DATA_PATH` to your local data directory
+- For Tree Ring Memory: install the `tree-ring` CLI or set `TREE_RING_BIN`
diff --git a/catalog.json b/catalog.json
index 03fac76..5b1262b 100644
--- a/catalog.json
+++ b/catalog.json
@@ -143,6 +143,13 @@
       "link": "https://qdrant.tech",
       "logo": "https://www.google.com/s2/favicons?sz=32&domain=qdrant.tech"
     },
+    "tree-ring": {
+      "key": "tree-ring",
+      "description": "Local-first Rust CLI memory using SQLite/FTS, ring lifecycle metadata, sensitivity checks, and project-scoped recall. Requires the tree-ring binary on PATH or TREE_RING_BIN.",
+      "kind": "local",
+      "link": "https://github.com/TerminallyLazy/Tree-Ring-Memory",
+      "logo": "https://raw.githubusercontent.com/TerminallyLazy/Tree-Ring-Memory/main/assets/tree-ring-memory-logo.png"
+    },
     "supermemory": {
       "key": "supermemory",
       "description": "Supermemory cloud API with temporal metadata support.",
@@ -162,4 +169,4 @@
       "description": "Bypasses the benchmark retrieval pipeline entirely \u2014 calls the provider's own native direct_answer() for providers that have built-in agentic answering."
     }
   }
-}
\ No newline at end of file
+}
diff --git a/src/memory_bench/memory/__init__.py b/src/memory_bench/memory/__init__.py
index fe30a2e..6b14f72 100644
--- a/src/memory_bench/memory/__init__.py
+++ b/src/memory_bench/memory/__init__.py
@@ -9,6 +9,7 @@
 from .hybrid_search import HybridSearchMemoryProvider
 from .ogham import OghamMemoryProvider
 from .supermemory import SupermemoryMemoryProvider
+from .tree_ring import TreeRingMemoryProvider
 
 REGISTRY: dict[str, type[MemoryProvider]] = {
     "bm25": BM25MemoryProvider,
@@ -24,6 +25,7 @@
     "ogham": OghamMemoryProvider,
     "qdrant": HybridSearchMemoryProvider,
     "supermemory": SupermemoryMemoryProvider,
+    "tree-ring": TreeRingMemoryProvider,
 }
 
 
diff --git a/src/memory_bench/memory/tree_ring.py b/src/memory_bench/memory/tree_ring.py
new file mode 100644
index 0000000..5f24507
--- /dev/null
+++ b/src/memory_bench/memory/tree_ring.py
@@ -0,0 +1,238 @@
+"""Tree Ring Memory provider for Agent Memory Benchmark.
+
+Uses the local ``tree-ring`` Rust CLI through JSONL import/export-friendly
+commands. Set ``TREE_RING_BIN`` to point at a non-PATH binary.
+"""
+
+from __future__ import annotations
+
+import hashlib
+import json
+import os
+import shutil
+import subprocess
+import uuid
+from datetime import datetime, timezone
+from pathlib import Path
+from typing import Any
+
+from ..models import Document
+from .base import MemoryProvider
+
+
+class TreeRingMemoryProvider(MemoryProvider):
+    name = "tree-ring"
+    description = (
+        "Local-first Rust CLI memory using SQLite/FTS, ring lifecycle metadata, "
+        "sensitivity checks, and project-scoped recall. Requires the tree-ring "
+        "binary on PATH or TREE_RING_BIN."
+    )
+    kind = "local"
+    link = "https://github.com/TerminallyLazy/Tree-Ring-Memory"
+    logo = (
+        "https://raw.githubusercontent.com/TerminallyLazy/Tree-Ring-Memory/main/"
+        "assets/tree-ring-memory-logo.png"
+    )
+    concurrency = 1
+
+    def __init__(self) -> None:
+        self._binary = os.environ.get("TREE_RING_BIN", "tree-ring")
+        self._root: Path | None = None
+        self._default_project = "amb"
+
+    def initialize(self) -> None:
+        self._binary = self._resolve_binary(self._binary)
+        completed = subprocess.run(
+            [self._binary, "--version"],
+            text=True,
+            capture_output=True,
+            check=False,
+        )
+        if completed.returncode != 0:
+            raise RuntimeError(
+                "tree-ring CLI is not runnable. Install Tree Ring Memory or set "
+                f"TREE_RING_BIN. stderr: {completed.stderr.strip()}"
+            )
+
+    def prepare(
+        self, store_dir: Path, unit_ids: set[str] | None = None, reset: bool = True
+    ) -> None:
+        del unit_ids
+        self._root = store_dir / "tree-ring"
+        if reset and self._root.exists():
+            shutil.rmtree(self._root)
+        self._root.mkdir(parents=True, exist_ok=True)
+        self._run("init")
+
+    def ingest(self, documents: list[Document]) -> None:
+        if not documents:
+            return
+
+        root = self._ensure_root()
+        batch_path = root / f"amb-ingest-{uuid.uuid4().hex}.jsonl"
+        try:
+            lines = [
+                json.dumps(self._event_for_document(doc), ensure_ascii=False)
+                for doc in documents
+            ]
+            batch_path.write_text("\n".join(lines) + "\n", encoding="utf-8")
+            self._run("import", str(batch_path))
+        finally:
+            batch_path.unlink(missing_ok=True)
+
+    def retrieve(
+        self,
+        query: str,
+        k: int = 10,
+        user_id: str | None = None,
+        query_timestamp: str | None = None,
+    ) -> tuple[list[Document], dict | None]:
+        del query_timestamp
+        args = ["recall", query, "--limit", str(k), "--include-sensitive"]
+        project = self._project_for(user_id)
+        if project:
+            args.extend(["--project", project])
+
+        payload = self._run(*args)
+        raw = json.loads(payload) if payload else []
+
+        docs: list[Document] = []
+        for item in raw:
+            memory = item.get("memory", {})
+            source = memory.get("source") or {}
+            doc_id = source.get("ref") or memory.get("id", "")
+            content = self._content_for_memory(memory, item)
+            if content.strip():
+                docs.append(Document(id=str(doc_id), content=content, user_id=project))
+        return docs, {"provider": self.name, "results": raw}
+
+    def _event_for_document(self, doc: Document) -> dict[str, Any]:
+        now = datetime.now(timezone.utc).isoformat(timespec="microseconds").replace(
+            "+00:00", "Z"
+        )
+        project = self._project_for(doc.user_id)
+        return {
+            "id": self._stable_memory_id(doc.id, project),
+            "created_at": now,
+            "updated_at": now,
+            "project": project,
+            "agent_profile": None,
+            "scope": "eval",
+            "ring": "cambium",
+            "event_type": "benchmark_document",
+            "summary": self._format_document(doc),
+            "details": "",
+            "source": {
+                "type": "benchmark",
+                "ref": doc.id,
+                "quote": "",
+            },
+            "tags": ["amb", f"doc_id:{doc.id}"],
+            "salience": 0.5,
+            "confidence": 0.5,
+            "sensitivity": "normal",
+            "retention": "normal",
+            "expires_at": None,
+            "supersedes": [],
+            "superseded_by": None,
+            "links": [],
+            "review": {
+                "needs_review": False,
+                "review_reason": None,
+                "reviewed_at": None,
+                "reviewed_by": None,
+            },
+        }
+
+    def _format_document(self, doc: Document) -> str:
+        parts = [f"Doc ID: {doc.id}"]
+        if doc.user_id:
+            parts.append(f"User ID: {doc.user_id}")
+        if doc.timestamp:
+            parts.append(f"Timestamp: {doc.timestamp}")
+        if doc.context:
+            parts.append(f"Context: {doc.context}")
+
+        messages = doc.messages
+        if not messages and doc.content.strip().startswith("["):
+            try:
+                parsed = json.loads(doc.content)
+                if isinstance(parsed, list):
+                    messages = parsed
+            except (json.JSONDecodeError, TypeError):
+                pass
+
+        if messages:
+            for msg in messages:
+                if not isinstance(msg, dict):
+                    continue
+                role = str(msg.get("role") or "message").title()
+                content = str(msg.get("content") or "").strip()
+                if content:
+                    parts.append(f"{role}: {content}")
+        elif doc.content.strip():
+            parts.append(doc.content)
+
+        return "\n".join(parts)
+
+    def _content_for_memory(self, memory: dict[str, Any], item: dict[str, Any]) -> str:
+        lines = []
+        source = memory.get("source") or {}
+        if source.get("ref"):
+            lines.append(f"Doc ID: {source['ref']}")
+        if memory.get("project"):
+            lines.append(f"Project: {memory['project']}")
+        lines.append(str(memory.get("summary") or ""))
+        if item.get("score") is not None:
+            lines.append(f"score: {item['score']:.3f}")
+        return "\n".join(lines)
+
+    def _run(self, *args: str) -> str:
+        root = self._ensure_root()
+        completed = subprocess.run(
+            [self._binary, "--root", str(root), "--json", *args],
+            text=True,
+            capture_output=True,
+            check=False,
+        )
+        if completed.returncode != 0:
+            command = (
+                f"{Path(self._binary).name} --root <store> --json "
+                f"{args[0] if args else ''}"
+            )
+            raise RuntimeError(
+                "tree-ring command failed: "
+                f"{command}\nstdout: {completed.stdout[-2000:]}\nstderr: {completed.stderr[-2000:]}"
+            )
+        return completed.stdout.strip()
+
+    def _ensure_root(self) -> Path:
+        if self._root is None:
+            raise RuntimeError("Tree Ring provider was used before prepare()")
+        return self._root
+
+    def _resolve_binary(self, value: str) -> str:
+        expanded = Path(value).expanduser()
+        has_path_separator = os.sep in value or (
+            os.altsep is not None and os.altsep in value
+        )
+        if has_path_separator:
+            if not expanded.exists():
+                raise RuntimeError(f"TREE_RING_BIN does not exist: {expanded}")
+            return str(expanded)
+
+        resolved = shutil.which(value)
+        if resolved is None:
+            raise RuntimeError(
+                "tree-ring CLI not found. Install Tree Ring Memory or set TREE_RING_BIN "
+                "to a built tree-ring executable."
+            )
+        return resolved
+
+    def _project_for(self, user_id: str | None) -> str:
+        return str(user_id) if user_id is not None else self._default_project
+
+    @staticmethod
+    def _stable_memory_id(doc_id: str, project: str) -> str:
+        digest = hashlib.sha256(f"{project}\0{doc_id}".encode("utf-8")).hexdigest()
+        return f"mem_amb_{digest[:24]}"