Louis Patrick "Lou" Rowan (2 May 1925 – 3 February 2017) was an Australian Test cricket match umpire. He umpired a total of 25 Test matches between 1963 and 1971. He also umpired the first One Day International match at the Melbourne Cricket Ground on 5 January 1971. He was also a police detective in Queensland. He was born in Murwillumbah, New South Wales.