William Nicholson (1753—May 21, 1815) was a renowned English chemist who was also a writer on natural philosophy and chemistry as well as a translator, journalist, publisher, scientist, and inventor.
William Nicholson (27 February 1816—10 March 1865) was an Australian colonial politician who became the third Premier of Victoria. He is remembered for having been called the "father of the ballot" due to his responsibility in introducing the secret ballot in Victoria.