William Nicoll may refer to:
William Nicoll (politician, born 1657) (1657–1723), English-born American merchant and politician who served as the Speaker of the New York General Assembly William Nicoll Jr. (1702–1768), English-American merchant and politician who served as the Speaker of the New York General Assembly, son of the above Sir William Robertson Nicoll (1851–1923), Scottish Free Church minister, journalist and editor William M. Nicoll (1893–1970), Scottish-American lawyer, politician, and judge from New York
See also William Nicol (disambiguation) William Nichol (disambiguation)