William Nicol

William Nicol may refer to:


 * William Nicol (geologist) (1770–1851), Scottish physicist and geologist
 * William Nicol (surgeon) (1790–1879), Member of Parliament for Dover, 1859–1865
 * William Nicol (Transvaal) (1887–1967), clergyman and Governor of the Transvaal
 * William Nicol (teacher) (1744–1797), Scottish schoolmaster and friend of Robert Burns