Louis Walter George Marchant (5 July 1916 – 1983) was an English diver who competed at the 1948 Summer Olympics.
Marchant was born in Wandsworth, London and was a member of the Highgate Diving Club.
Marchant represented England at the 1934 British Empire Games in London, where he competed in the 10 metres platform event, winning a bronze medal.
At the 1948 Olympic Games in London, he also competed in the men's 10 metre platform event.