SS Cassimir was a Design 1022 cargo ship built for the United States Shipping Board immediately after World War I.

She was laid down at yard number 1531 at the Philadelphia, Pennsylvania shipyard of the American International Shipbuilding Corporation, one of 110 Design 1022 cargo ships built for the United States Shipping Board.

[1] In 1922, she was purchased by the Curtis Bay Copper & Iron Works (Baltimore, Maryland).

[1] In 1923, she was purchased by the Cuban Distilling Company [1] where she was utilized to transport blackstrap molasses, a byproduct of sugar refining, to the United States where it would be used to produce cattle feed, vinegar and denatured alcohol.

On February 26, 1942, she collided with the U.S. freighter SS Lara and sank southeast of Wilmington, North Carolina (33°28′N 77°34′W / 33.467°N 77.567°W / 33.467; -77.567).