Louis Patrick “Lou” Rowan (born 2 May 1925 in Murwillumbah, New South Wales), was an Australian Test cricket match umpire. He umpired 25 Test matches between 1963 and 1971 and became Australia's senior umpire after the retirement of Col Egar. As a Detective Sergeant with the Queensland drug squad Rowan took no nonsense and was inclined to stand on his authority.