Mardy A.F.C. was a Welsh football team that played in the Southern League in the 1910s and 1920s. They were based in the village of Maerdy, Glamorgan. They joined the Southern League (Division Two) for the 1911–12 season, but left at the end of 1913–14. After World War I they rejoined the league in 1919–20 and the following season their league was renamed as the Welsh Section. Their last full season in the league was 1921–22, as after starting the 1922–23 season their record was expunged. Former Mardy players include Jack Cartmell, John Goodall and Proctor Hall.