Alexander Tolmer (1815 – 7 March 1890) was a South Australian police officer and Police Commissioner. He was educated at Plymouth, Rouen, Maidstone and Hawkhurst. He migrated to South Australia in 1840 where he was made sub-inspector by Governor George Gawler. Senior Inspector (c. 1811–1891) was suspended in September 1853.In November 1853, following an inquiry into police morale and efficiency, Tolmer was demoted to Chief Inspector (he ascribed the blame to Stuart, his temporary replacement while on Gold Escort duty), and six months later was sidelined to the Public Service.