diff --git a/src/pf1e_simulator/conditions.py b/src/pf1e_simulator/conditions.py
index de5f99e..f643240 100644
--- a/src/pf1e_simulator/conditions.py
+++ b/src/pf1e_simulator/conditions.py
@@ -207,9 +207,12 @@ PARALYZED = Condition(
 )
 
 # Nauseated: can't attack/cast/concentrate; only single move action (CRB)
+# SRD "Conditions—Nauseated": "The character is unable to attack, cast
+# spells... " — being unable to attack also denies attacks of opportunity.
 NAUSEATED = Condition(
     name="nauseated",
     cant_attack=True,
+    cant_aoo=True,
 )
 
 # Dazed: can't act, no AC penalty (CRB)
diff --git a/tests/test_aoo_defense.py b/tests/test_aoo_defense.py
index c7c65d7..aba7738 100644
--- a/tests/test_aoo_defense.py
+++ b/tests/test_aoo_defense.py
@@ -135,3 +135,22 @@ def test_aoo_not_suppressed_by_partial_concealment() -> None:
     assert engine._resolve_aoo(guard_s, runner_s) is False
     assert engine._aoo_used.get("guard", 0) == 1
     assert not any("suppressed" in line for line in engine._transcript)
+
+
+def test_nauseated_guard_makes_no_aoo() -> None:
+    """Given: the guard is nauseated (SRD: "unable to attack")
+    When: the runner provokes an AoO
+    Then: no opportunity is taken — no die rolled, no budget spent."""
+    runner = make_combatant("runner", hp=20, ac=12)
+    guard = make_combatant("guard", hp=20, ac=15, attack_bonus=5)
+    states = [
+        make_state(runner, "players", (2, 1)),
+        make_state(guard, "monsters", (2, 0)),
+    ]
+    engine = CombatEngine(ScriptedRng([15, 3]), _grid(("....", "....")), states)
+    runner_s, guard_s = engine._states
+    _add_condition(guard_s, "nauseated")
+    assert engine._resolve_aoo(guard_s, runner_s) is False
+    assert engine._aoo_used.get("guard", 0) == 0
+    assert len(engine._rng._queue) == 2
+    assert runner_s.hp == 20