USS Yorktown (CV-5) was an aircraft carrier that served in the United States Navy during World War II. Named after the Battle of Yorktown in 1781, she was commissioned in 1937. Yorktown was the lead ship of the Yorktown class, which was designed on the basis of lessons learned from operations with the converted battlecruisers of the Lexington class and the smaller purpose-built USS Ranger.

Yorktown was at port in Norfolk during the attack on Pearl Harbor, having just completed a patrol of the Atlantic Ocean. She then sailed to San Diego in late December 1941 and was incorporated as the flagship of Task Force 17. Together with the carrier Lexington, she successfully attacked Japanese shipping off the east coast of New Guinea in early March 1942. Her aircraft sank or damaged several warships supporting the invasion of Tulagi in early May. Yorktown rendezvoused with Lexington in the Coral Sea and attempted to stop the invasion of Port Moresby, Papua New Guinea. They sank the light aircraft carrier Shōhō on 7 May during the Battle of the Coral Sea, but did not encounter the main Japanese force of the carriers Shōkaku and Zuikaku until the next day. Aircraft from Lexington and Yorktown badly damaged Shōkaku, but the Japanese aircraft critically damaged Lexington (which was later scuttled), and damaged Yorktown.

Despite the damage suffered, Yorktown was able to return to Hawaii. Although estimates were that the damage would take two weeks to repair, Yorktown put to sea only 72 hours after entering drydock at Pearl Harbor, which meant that she was available for the next confrontation with the Japanese. Yorktown played an important part in the Battle of Midway in early June. Yorktown's aircraft played crucial roles in sinking two Japanese fleet carriers. Yorktown also absorbed both Japanese aerial counterattacks at Midway which otherwise would have been directed at the carriers USS Enterprise and Hornet. On 4 June, during the Battle of Midway, Japanese aircraft crippled Yorktown. She lost all power and developed a 23-degree list to port. Salvage efforts on Yorktown were encouraging, and she was taken in tow by USS Vireo. In the late afternoon of 6 June, the Japanese submarine I-168 fired a salvo of torpedoes, two of which struck Yorktown, and a third sinking the destroyer USS Hammann, which had been providing auxiliary power to Yorktown. With further salvage efforts deemed hopeless, the remaining repair crews were evacuated from Yorktown, which sank on the morning of 7 June. The wreck of Yorktown was located in May 1998 by Robert Ballard.