William Beatty Rochester (29 January 1789-14 June 1838) was a member of the US House of Representatives (DR-NY 20) from 4 March 1821 to 3 March 1823 (succeeding Caleb Baker and Jonathan Richmond and preceding Ela Collins and Egbert Ten Eyck) and from NY-28 from 4 March to 21 April 1823 (preceding William Woods). Born in Hagerstown, Maryland, the son of Nathaniel Rochester and the brother of Thomas H. Rochester, he served in the War of 1812 before practicing law in Bath and Angelica, New York, serving in the state assembly, serving in Congress as a Bucktail Democratic-Republican, and as Minister to Colombia in 1826, Central America from 1827 to 1828, and Guatemala in 1827. He died in 1838.