diff --git a/scrapy/utils/datatypes.py b/scrapy/utils/datatypes.py
index 4e65c062e..dd0e062d0 100644
--- a/scrapy/utils/datatypes.py
+++ b/scrapy/utils/datatypes.py
@@ -152,7 +152,9 @@ class LocalCache(OrderedDict[_KT, _VT]):
         self.limit: int | None = limit
 
     def __setitem__(self, key: _KT, value: _VT) -> None:
-        if self.limit:
+        if self.limit is not None:
+            if self.limit == 0:
+                return
             while len(self) >= self.limit:
                 self.popitem(last=False)
         super().__setitem__(key, value)
diff --git a/tests/test_utils_datatypes.py b/tests/test_utils_datatypes.py
index ba6b82503..b465f01dd 100644
--- a/tests/test_utils_datatypes.py
+++ b/tests/test_utils_datatypes.py
@@ -309,6 +309,17 @@ class TestLocalCache:
             assert str(x) in cache
             assert cache[str(x)] == x
 
+    def test_cache_with_zero_limit(self):
+        # limit=0 means cache is disabled, no items should be stored
+        cache = LocalCache(limit=0)
+        cache["a"] = 1
+        cache["b"] = 2
+        cache["c"] = 3
+        assert len(cache) == 0
+        assert "a" not in cache
+        assert "b" not in cache
+        assert "c" not in cache
+
 
 class TestLocalWeakReferencedCache:
     def test_cache_with_limit(self):