The USS San Diego (CL-53) was an Atlanta-class light cruiser of the United States Navy, commissioned just after the US entry into World War II, and active throughout the Pacific theater. Armed with 16 5 in (127 mm)/38 cal DP anti-aircraft guns and 16 Bofors 40 mm AA guns, the Atlanta-class cruisers had one of the heaviest anti-aircraft broadsides of any warship of World War II.