Josiah Butler Williams (December 16, 1810 – September 26, 1883) was an American businessman, banker and senator from New York.
He married Mary Huggeford Hardy (1824–1911), and they had 12 children, among them geologist Henry Shaler Williams (1847–1918).
The party managers then substituted Hard Democrat Clark Burnham on the ticket but, due to slow communications, Williams still polled almost 60,000 votes.
He was a presidential elector in 1856, voting for John C. Frémont and William L. Dayton.
State Senator Timothy S. Williams (1800–1849) was his brother; lumber magnate Henry W. Sage (1814–1897) was his nephew.