Benson Leavitt (21 June 1797–1 June 1869) was a Boston, Massachusetts, businessman, born in New Hampshire, who served as an Alderman of Boston, and later as acting mayor after the incumbent became incapacitated and died while in office. In 1814, when Thomas Leavitt's son Benson was 17 years old, the future mayor served with 40 men from Hampton Falls who marched to Portsmouth, New Hampshire, then under threat of attack by British forces during the War of 1812. Benson Leavitt later married Abigail Ward, born at Hampton Falls in 1801, daughter of Capt. Thomas and Abigail (Garland) Ward.