Leroy John Alexanderson (June 27, 1910 – February 28, 2004) was the last captain of the SS United States, the largest ocean liner ever built in the United States and the fastest ocean liner in history.
He attended the SUNY Maritime College at Fort Schuyler, then known as the New York Merchant Marine Academy.
In 1938 he volunteered for active duty in the United States Navy, and was assigned to the USS Melville (AD-2).
Following decommissioning of the Gage in 1947, Alexanderson returned to Merchant Marine Service with the United States Lines.
At the time he was the only reserve officer of flag rank within the United States Merchant Marine, having been promoted to rear admiral in 1959.