SS Pan-Pennsylvania was a Type T3-S-BF1 tanker of the United States, which was sunk by German U-boat U-550 in April 1944.

The ship was built at the Welding Shipyards in Norfolk, Virginia, under Maritime Commission contract #2187, and was delivered to National Bulk Carriers, Inc. in November 1943.

[4] Pan-Pennsylvania sailed from New York Harbor on the afternoon of 15 April 1944 as part of convoy CU-21, bound for England, carrying 140,000 barrels of 80-octane aviation fuel, a crew of 50 men, and 31 members of the Naval Armed Guard.

Aboard Pan-Pennsylvania a fire broke out in the engine room, and the captain ordered the crew to abandon ship, as she began to settle and list to port.

[5] U-550, meanwhile, attempted to slip away, but was detected by Joyce, which promptly attacked with a pattern of 13 depth charges, bracketing the submarine and forcing her to the surface.