William Sulzer (March 18, 1863 November 6, 1941) was an American lawyer and politician, nicknamed Plain Bill Sulzer. He was the 39th Governor of New York and a long-serving congressman from the same state.

Sulzer was the first, and to date only, New York governor to be impeached and the only governor to be convicted on articles of impeachment. He broke with his sponsors at Tammany Hall, and they produced convincing evidence that Sulzer had falsified his sworn statement of campaign expenditures.

The governor of New York is the head of government of the U.S. state of New York. The governor is the head of the executive branch of New York's state government and the commander-in-chief of the state's military forces. The governor has a duty to enforce state laws and the power to either approve or veto bills passed by the New York Legislature, to convene the legislature and grant pardons, except in cases of impeachment and treason.