diff --git a/src/py/mat3ra/notebooks_utils/auth.py b/src/py/mat3ra/notebooks_utils/auth.py
index b8c3cb634..239b34afb 100644
--- a/src/py/mat3ra/notebooks_utils/auth.py
+++ b/src/py/mat3ra/notebooks_utils/auth.py
@@ -3,11 +3,12 @@
 
 from mat3ra.api_client import ACCESS_TOKEN_ENV_VAR
 
-from .core.api.auth import authenticate_oidc
+from .core.api.auth import authenticate_oidc, get_oidc_base_url, store_token_data_in_environment
 from .io import get_data
 from .ipython.ui import show_device_flow_popup
 from .primitive.environment import ENVIRONMENT, EnvironmentsEnum
 from .pyodide.api.auth import authenticate_jupyterlite
+from .token_store import load_token, save_token
 
 REFRESH_TOKEN_ENV_VAR = "OIDC_REFRESH_TOKEN"
 
@@ -25,4 +26,10 @@ async def authenticate(force=False, globals_dict=None):
     if data_from_host:
         await authenticate_jupyterlite(data_from_host)
     elif ACCESS_TOKEN_ENV_VAR not in os.environ or force:
-        await authenticate_oidc(show_popup=show_device_flow_popup)
+        oidc_url = get_oidc_base_url()
+        cached = None if force else await load_token(oidc_url)
+        if cached:
+            store_token_data_in_environment(cached)
+        else:
+            token_data = await authenticate_oidc(show_popup=show_device_flow_popup)
+            await save_token(oidc_url, token_data)
diff --git a/src/py/mat3ra/notebooks_utils/core/api/token_store.py b/src/py/mat3ra/notebooks_utils/core/api/token_store.py
new file mode 100644
index 000000000..0d4834d1d
--- /dev/null
+++ b/src/py/mat3ra/notebooks_utils/core/api/token_store.py
@@ -0,0 +1,51 @@
+"""OIDC token cache — business logic + file-based storage (default)."""
+
+import json
+import os
+import sys
+import time
+from typing import Optional
+
+_EXPIRY_BUFFER = 60  # seconds before actual expiry to consider token stale
+_FILE_PATH = os.path.join(os.path.expanduser("~"), ".mat3ra", "oidc_token_cache.json")
+
+# Storage backend: defaults to this module (file-based).
+# Overridden by top-level token_store.py for Pyodide (IndexedDB).
+_storage = sys.modules[__name__]
+
+
+async def read() -> dict:
+    try:
+        with open(_FILE_PATH) as f:
+            return json.load(f)
+    except Exception:
+        return {}
+
+
+async def write(cache: dict) -> None:
+    os.makedirs(os.path.dirname(_FILE_PATH), mode=0o700, exist_ok=True)
+    with open(_FILE_PATH, "w") as f:
+        json.dump(cache, f)
+    os.chmod(_FILE_PATH, 0o600)
+
+
+async def save_token(oidc_url: str, token_data: dict) -> None:
+    token_cache_entry = dict(token_data)
+    token_cache_entry["expires_at"] = time.time() + token_cache_entry.get("expires_in", 3600)
+
+    token_cache = await _storage.read()
+    token_cache[oidc_url] = token_cache_entry
+    await _storage.write(token_cache)
+
+
+async def load_token(oidc_url: str) -> Optional[dict]:
+    token_cache_entry = (await _storage.read()).get(oidc_url)
+
+    if not token_cache_entry:
+        return None
+
+    expires_at = token_cache_entry.get("expires_at", 0)
+    if expires_at <= time.time() + _EXPIRY_BUFFER:
+        return None
+
+    return token_cache_entry
diff --git a/src/py/mat3ra/notebooks_utils/pyodide/api/token_store.py b/src/py/mat3ra/notebooks_utils/pyodide/api/token_store.py
new file mode 100644
index 000000000..2926dafe6
--- /dev/null
+++ b/src/py/mat3ra/notebooks_utils/pyodide/api/token_store.py
@@ -0,0 +1,45 @@
+"""IndexedDB-based OIDC token cache for Pyodide Web Workers."""
+
+import json
+
+from pyodide.code import run_js  # type: ignore
+
+_idb = run_js(
+    """
+(function() {
+    const open = () => new Promise(resolve => {
+        const req = indexedDB.open("mat3ra", 1);
+        req.onupgradeneeded = () => req.result.createObjectStore("tokens");
+        req.onsuccess = () => resolve(req.result);
+        req.onerror = () => resolve(null);
+    });
+    return {
+        get: async () => {
+            const db = await open();
+            if (!db) return null;
+            return new Promise(resolve => {
+                const g = db.transaction("tokens").objectStore("tokens").get("oidc_cache");
+                g.onsuccess = () => { db.close(); resolve(g.result || null); };
+                g.onerror = () => { db.close(); resolve(null); };
+            });
+        },
+        set: async (data) => {
+            const db = await open();
+            if (!db) return;
+            const tx = db.transaction("tokens", "readwrite");
+            tx.objectStore("tokens").put(data, "oidc_cache");
+            return new Promise(resolve => { tx.oncomplete = () => { db.close(); resolve(); }; });
+        }
+    };
+})()
+"""
+)
+
+
+async def read() -> dict:
+    result = await _idb.get()
+    return json.loads(str(result)) if result else {}
+
+
+async def write(cache: dict) -> None:
+    await _idb.set(json.dumps(cache))
diff --git a/src/py/mat3ra/notebooks_utils/token_store.py b/src/py/mat3ra/notebooks_utils/token_store.py
new file mode 100644
index 000000000..f2efec5c4
--- /dev/null
+++ b/src/py/mat3ra/notebooks_utils/token_store.py
@@ -0,0 +1,10 @@
+"""Persist OIDC tokens across notebook kernels — thin routing adapter."""
+
+from .core.api.token_store import load_token, save_token  # noqa: F401 — re-export
+from .primitive.environment import is_pyodide_environment
+
+if is_pyodide_environment():
+    from .core.api import token_store as _core_ts
+    from .pyodide.api import token_store as _pyodide_storage
+
+    _core_ts._storage = _pyodide_storage