John Jefferson Wolcott (June 20, 1810 Trenton, Oneida County, New York – July 31, 1881 Fulton, Oswego County) was an American merchant, banker and politician from New York.
He was the son of Samuel Wolcott (c. 1775 – 1857).
On September 10, 1835, he married Sarah Ann Fox (1814–1888).
Wolcott entered politics as a Democrat, sided with the Barnburners, joined the Free Soil Party in 1848, then became a Soft-Shell Democrat, and finally joined the Republican Party upon its foundation.
He was Chairman of the Board of Supervisors of Oswego County in 1854; President of the Village of Fulton for two terms; a member of the New York State Assembly (Oswego Co., 2nd D.) in 1858; and a member of the New York State Senate (21st D.) in 1866 and 1867.