Lieutenant General Desmond Maurice "Des" Mueller AO (born 25 July 1943) is a retired senior officer of the Australian Army. He served as Vice Chief of the Defence Force from June 2000 until his retirement in July 2002. Mueller was awarded Member of the Order of Australia (AM) in 1993, and was elevated to Officer of the Order of Australia (AO) in 1998. Following retirement from the Army, Mueller continued a career in consulting, management and academia, serving as an adjunct professor at Monash and Latrobe universities.