USS Comfort (AH-3) was a hospital ship for the United States Navy in World War I. She was the sister ship of USS Mercy (AH-4) but the two ships were not of a ship class. Comfort was known as SS Havana in passenger service for the Ward Line, and as USAT Havana in United States Army service before her Navy service. Her name was restored to Havana in 1927, and she was renamed SS Yucatán in 1935, and SS Agwileon in 1941. In World War II, she was known as USAT Agwileon and USAHS Shamrock in service for the United States Army.