diff --git a/plugins/autoGroup/autoGroup.py b/plugins/autoGroup/autoGroup.py
new file mode 100644
index 00000000..8564f3a7
--- /dev/null
+++ b/plugins/autoGroup/autoGroup.py
@@ -0,0 +1,221 @@
+"""Auto Group: creates and assigns Stash Groups from customizable filename regex rules.
+
+Rules are a JSON array of {"pattern": <regex>, "group": <template>}. "pattern" is matched
+against each scene's file basename (not the full path) with re.search; named capture groups
+(?P<name>...) can be
+referenced in "group" as {name}. A capture group literally named "index" is used as the
+scene's scene_index inside the group (e.g. an episode number), if present and numeric.
+First matching rule wins per scene.
+"""
+import json
+import os
+import re
+import sys
+
+import stashapi.log as log
+from stashapi.stashapp import StashInterface
+
+DEFAULT_RULES = [
+    # "Title - Episode 4" / "Title_Part_6" / "Title (Ep. 1)" / "Title Day 2" / "Title Scene 3" -
+    # flexible separators before/after the keyword (space, dash, underscore, dot, parenthesis).
+    {
+        "pattern": r"^(?P<series>.+?)[\s_\-(]+(?:Ep(?:isode)?|Part|Pt|Scene|Day)[\s_.]*#?[\s_.]*(?P<index>\d+)\)?",
+        "group": "{series}",
+    },
+    # "Title 1 feat. Performer" - bare number immediately before "feat." as the anchor.
+    {
+        "pattern": r"^(?P<series>.+?)\s+(?P<index>\d+)\s+feat\.",
+        "group": "{series}",
+    },
+]
+
+PER_PAGE = 100
+
+
+def load_settings(stash):
+    config = stash.get_configuration().get("plugins", {}).get("autoGroup", {})
+    settings = {"rules": None, "onlyUngrouped": True, "dryRun": True}
+    settings.update({k: v for k, v in config.items() if v is not None})
+    rules = DEFAULT_RULES
+    if settings["rules"]:
+        try:
+            parsed = json.loads(settings["rules"])
+            if isinstance(parsed, list) and parsed:
+                rules = parsed
+            else:
+                log.warning("[AutoGroup] 'rules' non è una lista JSON valida, uso il default")
+        except Exception as e:
+            log.error(f"[AutoGroup] JSON delle regole non valido, uso il default: {e}")
+    compiled = []
+    for r in rules:
+        try:
+            compiled.append({"pattern": re.compile(r["pattern"], re.IGNORECASE), "group": r["group"]})
+        except Exception as e:
+            log.error(f"[AutoGroup] regola scartata (pattern non valido): {r} -> {e}")
+    return compiled, bool(settings["onlyUngrouped"]), bool(settings["dryRun"])
+
+
+def find_group(stash, name, cache):
+    """Looks up an existing group by exact name only - never creates one."""
+    if name in cache:
+        return cache[name]
+    found = stash.call_GQL(
+        "query($f: GroupFilterType){ findGroups(group_filter:$f){ groups { id name } } }",
+        {"f": {"name": {"value": name, "modifier": "EQUALS"}}},
+    )
+    groups = found["findGroups"]["groups"]
+    gid = groups[0]["id"] if groups else None
+    cache[name] = gid
+    return gid
+
+
+def create_group(stash, name, cache):
+    created = stash.call_GQL(
+        "mutation($input: GroupCreateInput!){ groupCreate(input:$input){ id } }",
+        {"input": {"name": name}},
+    )
+    gid = created["groupCreate"]["id"]
+    log.info(f"[AutoGroup] creato nuovo gruppo: '{name}'")
+    cache[name] = gid
+    return gid
+
+
+def match_rule(rules, path):
+    for rule in rules:
+        m = rule["pattern"].search(path)
+        if not m:
+            continue
+        gd = m.groupdict()
+        try:
+            group_name = rule["group"].format(**gd)
+        except KeyError as e:
+            log.error(f"[AutoGroup] placeholder {e} assente nel match di '{rule['group']}' su '{path}'")
+            continue
+        if not group_name.strip():
+            continue
+        scene_index = None
+        if gd.get("index") is not None:
+            try:
+                scene_index = int(gd["index"])
+            except ValueError:
+                pass
+        return group_name.strip(), scene_index
+    return None, None
+
+
+def run(stash):
+    rules, only_ungrouped, dry_run = load_settings(stash)
+    if not rules:
+        log.error("[AutoGroup] nessuna regola valida configurata, esco")
+        return
+
+    skipped_already_grouped = 0
+    checked_no_match = 0
+    page = 1
+    # name -> list of {id, scene_index, existing_groups, basename}
+    pending = {}
+
+    while True:
+        res = stash.call_GQL(
+            """query($page:Int!, $per:Int!){
+                findScenes(filter:{page:$page, per_page:$per, sort:"id", direction:ASC}) {
+                  count
+                  scenes { id groups { group { id } } files { path } }
+                }
+            }""",
+            {"page": page, "per": PER_PAGE},
+        )
+        scenes = res["findScenes"]["scenes"]
+        if not scenes:
+            break
+
+        for s in scenes:
+            existing_groups = s.get("groups") or []
+            if only_ungrouped and existing_groups:
+                skipped_already_grouped += 1
+                continue
+            files = s.get("files") or []
+            if not files:
+                continue
+            path = files[0].get("path") or ""
+            basename = os.path.basename(path)
+            group_name, scene_index = match_rule(rules, basename)
+            if not group_name:
+                checked_no_match += 1
+                continue
+            pending.setdefault(group_name, []).append(
+                {"id": s["id"], "scene_index": scene_index,
+                 "existing_groups": existing_groups, "basename": basename}
+            )
+
+        if len(scenes) < PER_PAGE:
+            break
+        page += 1
+
+    # A single new match only joins a group that already exists (e.g. one more episode of a
+    # series already grouped); it never creates a brand new group on its own - a Group with one
+    # scene in it is noise, not organization. 2+ new matches under the same name are enough
+    # evidence of a real series to create (or reuse) the group for all of them.
+    group_cache = {}
+    matched = 0
+    created_groups = 0
+    skipped_single_no_existing = 0
+
+    for group_name, items in pending.items():
+        if len(items) == 1:
+            gid = find_group(stash, group_name, group_cache)
+            if gid is None:
+                skipped_single_no_existing += 1
+                continue
+        else:
+            gid = group_cache.get(group_name) or find_group(stash, group_name, group_cache)
+
+        for item in items:
+            matched += 1
+            if dry_run:
+                idx_note = f" (scene_index={item['scene_index']})" if item["scene_index"] is not None else ""
+                verb = "aggiungerebbe a" if gid else "creerebbe"
+                log.info(
+                    f"[AutoGroup] (dry-run) scena {item['id']} '{item['basename']}' -> "
+                    f"{verb} gruppo '{group_name}'{idx_note}"
+                )
+                continue
+            if gid is None:
+                gid = create_group(stash, group_name, group_cache)
+                created_groups += 1
+            keep = [
+                {"group_id": g["group"]["id"], "scene_index": None}
+                for g in item["existing_groups"]
+                if g["group"]["id"] != gid
+            ]
+            stash.call_GQL(
+                "mutation($input: SceneUpdateInput!){ sceneUpdate(input:$input){ id } }",
+                {
+                    "input": {
+                        "id": item["id"],
+                        "groups": keep + [{"group_id": gid, "scene_index": item["scene_index"]}],
+                    }
+                },
+            )
+
+    suffix = " (dry-run: nessuna modifica scritta)" if dry_run else ""
+    log.info(
+        f"[AutoGroup] fatto: {matched} scene assegnate ({created_groups} gruppi nuovi creati), "
+        f"{skipped_single_no_existing} match singoli scartati (nessun gruppo esistente con quel nome), "
+        f"{skipped_already_grouped} scene saltate perché già in un gruppo, "
+        f"{checked_no_match} controllate ma nessuna regola combaciava{suffix}"
+    )
+
+
+def main():
+    json_input = json.loads(sys.stdin.read())
+    stash = StashInterface(json_input["server_connection"])
+    mode = (json_input.get("args") or {}).get("mode")
+    if mode == "run":
+        run(stash)
+    else:
+        log.error(f"[AutoGroup] modalità sconosciuta: {mode!r}")
+
+
+if __name__ == "__main__":
+    main()
diff --git a/plugins/autoGroup/autoGroup.yml b/plugins/autoGroup/autoGroup.yml
new file mode 100644
index 00000000..e2469947
--- /dev/null
+++ b/plugins/autoGroup/autoGroup.yml
@@ -0,0 +1,34 @@
+name: Auto Group
+description: Automatically creates and assigns Stash Groups from customizable filename rules (regex).
+version: 1.0.0
+url: https://github.com/spesometro2026/stash-autogroup-plugin
+exec:
+  - python
+  - "{pluginDir}/autoGroup.py"
+interface: raw
+
+settings:
+  rules:
+    displayName: Rules (JSON)
+    description: >-
+      JSON array of {"pattern": <regex>, "group": <template>}. "pattern" is matched against
+      each scene's file basename (not the full path) with Python re.search; named capture
+      groups (?P<name>...) can be
+      referenced in "group" as {name}. A capture group literally named "index" is used as the
+      scene's position in the group (e.g. episode number), if present. First matching rule
+      wins. Leave empty to use the built-in default rule. See the plugin's README for examples.
+    type: STRING
+  onlyUngrouped:
+    displayName: Skip scenes that already have a group
+    description: When enabled (default), scenes that already belong to at least one group are left untouched, so re-running the task only picks up newly added scenes.
+    type: BOOLEAN
+  dryRun:
+    displayName: Dry run (log only, write nothing)
+    description: When enabled (default), matches are only logged - no Group is created and no scene is changed. Turn this off once you've checked the log and are happy with the matches.
+    type: BOOLEAN
+
+tasks:
+  - name: Run
+    description: Scan the library and apply the configured rules.
+    defaultArgs:
+      mode: run