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

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