Isaac Williams Jr. (April 5, 1777 - November 9, 1860) was a United States 
Representative from New York. Born in Goshen, Connecticut, he received a limited 
schooling, and in 1793 moved with his father to Otsego County, New York. He was 
appointed undersheriff of Otsego County in 1810 and in 1811 was appointed 
sheriff by the council of appointment and served until 1813. He successfully 
contested as a Democratic-Republican the election of John M. Bowers to the 
Thirteenth Congress to fill the vacancy caused by the death of William Dowse and 
served from December 20, 1813 to March 3, 1815. Williams was elected to the 
Fifteenth Congress and held office from March 4, 1817 to March 3, 1819; he was 
then elected to the Eighteenth Congress, holding office from March 4, 1823 to 
March 3, 1825. He was an unsuccessful candidate for sheriff in 1828, and in 1860 
died in Cooperstown. Interment was in Warren Cemetery, Otsego.