diff --git a/src/familiar/corp.py b/src/familiar/corp.py
new file mode 100644
index 0000000..3e7566d
--- /dev/null
+++ b/src/familiar/corp.py
@@ -0,0 +1,109 @@
+"""Read-only corporation organization tools.
+
+Membership, member tracking, divisions, titles, medals, standings (corp-level,
+need the relevant corp role) plus the character's own corp roles. Keyed off each
+logged-in character's corporation.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from fastmcp import FastMCP
+
+from .charutil import run_per_character, run_per_corp, summarize
+from .esi import client
+
+
+async def get_corp_members(character: str | int | None = None, limit: int = 50) -> dict[str, Any]:
+    """Corp member character ids (needs a corp role) for one character's corp or all."""
+
+    async def fetch(token: str, corp_id: int, cid: int) -> dict[str, Any]:
+        members = await client().get(f"/corporations/{corp_id}/members/", token=token) or []
+        return summarize(members, limit)
+
+    return await run_per_corp(character, fetch)
+
+
+async def get_corp_member_tracking(
+    character: str | int | None = None, limit: int = 50
+) -> dict[str, Any]:
+    """Member tracking (last login, location, ship) — needs the Director role."""
+
+    async def fetch(token: str, corp_id: int, cid: int) -> dict[str, Any]:
+        tracking = await client().get(f"/corporations/{corp_id}/membertracking/", token=token) or []
+        return summarize(tracking, limit)
+
+    return await run_per_corp(character, fetch)
+
+
+async def get_corp_divisions(character: str | int | None = None) -> dict[str, Any]:
+    """Corp hangar/wallet division names (needs the Director role)."""
+
+    async def fetch(token: str, corp_id: int, cid: int) -> dict[str, Any]:
+        data = await client().get(f"/corporations/{corp_id}/divisions/", token=token) or {}
+        return {"hangar": data.get("hangar"), "wallet": data.get("wallet")}
+
+    return await run_per_corp(character, fetch)
+
+
+async def get_corp_titles(character: str | int | None = None, limit: int = 50) -> dict[str, Any]:
+    """Corp titles and their granted roles (needs a corp role)."""
+
+    async def fetch(token: str, corp_id: int, cid: int) -> dict[str, Any]:
+        titles = await client().get(f"/corporations/{corp_id}/titles/", token=token) or []
+        return summarize(titles, limit)
+
+    return await run_per_corp(character, fetch)
+
+
+async def get_corp_medals(character: str | int | None = None, limit: int = 50) -> dict[str, Any]:
+    """Corp medals (needs a corp role)."""
+
+    async def fetch(token: str, corp_id: int, cid: int) -> dict[str, Any]:
+        medals = await client().get_all_pages(f"/corporations/{corp_id}/medals/", token=token)
+        return summarize(medals, limit)
+
+    return await run_per_corp(character, fetch)
+
+
+async def get_corp_standings(character: str | int | None = None, limit: int = 50) -> dict[str, Any]:
+    """Corp standings toward other entities (needs a corp role)."""
+
+    async def fetch(token: str, corp_id: int, cid: int) -> dict[str, Any]:
+        standings = await client().get_all_pages(f"/corporations/{corp_id}/standings/", token=token)
+        return summarize(standings, limit)
+
+    return await run_per_corp(character, fetch)
+
+
+async def get_my_corp_roles(character: str | int | None = None) -> dict[str, Any]:
+    """The character's own corp roles (character endpoint, no special role needed)."""
+
+    async def fetch(token: str, cid: int) -> dict[str, Any]:
+        data = await client().get(f"/characters/{cid}/roles/", token=token) or {}
+        return {
+            "roles": data.get("roles"),
+            "roles_at_hq": data.get("roles_at_hq"),
+            "roles_at_base": data.get("roles_at_base"),
+            "roles_at_other": data.get("roles_at_other"),
+        }
+
+    return await run_per_character(character, fetch)
+
+
+TOOLS = [
+    get_corp_members,
+    get_corp_member_tracking,
+    get_corp_divisions,
+    get_corp_titles,
+    get_corp_medals,
+    get_corp_standings,
+    get_my_corp_roles,
+]
+
+
+def register(mcp: FastMCP) -> None:
+    """Register the corp organization tools onto the given server."""
+    for fn in TOOLS:
+        mcp.tool(fn)
diff --git a/src/familiar/server.py b/src/familiar/server.py
index d520c0f..2a4943a 100644
--- a/src/familiar/server.py
+++ b/src/familiar/server.py
@@ -14,6 +14,7 @@ from fastmcp import FastMCP
 from . import (
     __version__,
     account,
+    corp,
     industry,
     killmails,
     market,
@@ -71,3 +72,6 @@ killmails.register(mcp)
 
 # Phase 4: character profile / social (read-only).
 profile.register(mcp)
+
+# Phase 4: corp organization (read-only, needs corp roles).
+corp.register(mcp)
diff --git a/tests/test_corp.py b/tests/test_corp.py
new file mode 100644
index 0000000..669f460
--- /dev/null
+++ b/tests/test_corp.py
@@ -0,0 +1,68 @@
+"""Corp organization tools (auth & ESI mocked)."""
+
+import asyncio
+
+import pytest
+
+from conftest import route
+from familiar import auth, corp
+from familiar.server import mcp
+
+CHARS = [{"character_id": 99, "character_name": "Alpha", "scopes": []}]
+
+
+@pytest.fixture
+def fake_auth(monkeypatch):
+    monkeypatch.setattr(auth, "list_characters", lambda: list(CHARS))
+
+    async def get_auth(cid, **kw):
+        return f"token-{cid}", cid
+
+    monkeypatch.setattr(auth, "get_auth", get_auth)
+    monkeypatch.setattr(auth, "resolve_character", lambda i: 99)
+    return CHARS
+
+
+def test_corp_members_resolves_corp(mock_esi, fake_auth):
+    fixtures = {"/members/": [1, 2, 3], "/characters/": {"corporation_id": 2000}}
+    mock_esi(lambda r: route(r, fixtures))
+    res = asyncio.run(corp.get_corp_members())
+    entry = res["characters"][0]
+    assert entry["corporation_id"] == 2000
+    assert entry["count"] == 3
+
+
+def test_corp_divisions(mock_esi, fake_auth):
+    fixtures = {
+        "/divisions/": {"hangar": [{"division": 1, "name": "Ore"}], "wallet": []},
+        "/characters/": {"corporation_id": 2000},
+    }
+    mock_esi(lambda r: route(r, fixtures))
+    res = asyncio.run(corp.get_corp_divisions())
+    assert res["characters"][0]["hangar"][0]["name"] == "Ore"
+
+
+def test_corp_medals_paginated(mock_esi, fake_auth):
+    fixtures = {"/medals/": [{"medal_id": 1}], "/characters/": {"corporation_id": 2000}}
+    mock_esi(lambda r: route(r, fixtures))
+    res = asyncio.run(corp.get_corp_medals())
+    assert res["characters"][0]["count"] == 1
+
+
+def test_my_corp_roles(mock_esi, fake_auth):
+    mock_esi(lambda r: route(r, {"/roles/": {"roles": ["Director", "Accountant"]}}))
+    res = asyncio.run(corp.get_my_corp_roles())
+    assert "Director" in res["characters"][0]["roles"]
+
+
+def test_corp_tools_registered():
+    tools = {t.name for t in asyncio.run(mcp.list_tools())}
+    assert {
+        "get_corp_members",
+        "get_corp_member_tracking",
+        "get_corp_divisions",
+        "get_corp_titles",
+        "get_corp_medals",
+        "get_corp_standings",
+        "get_my_corp_roles",
+    } <= tools