Captain Sir Charles MacMahon (10 July 1824 – 28 August 1891) was an Australian politician who twice served as Speaker of the Victorian Legislative Assembly and as Chief Commissioner of Victoria Police. MacMahon was born County Tyrone, Ireland, to a wealthy Irish family and served in the British army. He obtained a veterinary diploma in 1852, and soon left for Australia to join the gold rush. He arrived in Melbourne on 18 November 1852.