Sergeant major is a rank used in various military and police organizations. Sergeant major may also refer to: Military appointments Regimental sergeant major, an appointment in British and Commonwealth military organizations Company sergeant major, an appointment in British and Commonwealth military organizations People Léo Major (1921–2008), Canadian army sergeant twice awarded the Distinguished Conduct Medal Eric Clay (1922–2007), English rugby league football referee nicknamed "Sergeant Major" Other 3-5-8, a card game "Sgt. Major" (song), a song by Jet Sergeant major (fish), a tropical fish (Abudefduf saxatilis) Abrota ganga, a butterfly of Asia called the sergeant major