Undy Athletic Football Club are a Welsh football club based in the village of Undy, Monmouthshire. The club plays in the Cymru South league.
The club was formed in 1947, playing at local level in South Wales and winning the Argus Cup 3 times in 15 years. However, in 1962 the club disbanded as a result of financial difficulties. In 1970, the club reformed and maintained a consistent existence in the local leagues, winning the Gwent County League Division One in 2011 and reaching the Welsh Football League for the first time, entering in Division Three. They won promotion at the first attempt, and then under the guidance of Manager Laurence Owen, sealed their highest ever position in 2016 when they finished third in Division Two and earned promotion to Welsh Football League Division One, finishing in the top half of the top division in their first two seasons, step 2 on the Welsh football pyramid. This season also saw the first international footballer to play for Undy, with Gibraltar international Jamie Coombes signing for the club in February 2017. Laurence Owen brought an end to 32 years in club management by announcing his retirement at the end of 2017–18 after another successful campaign, he was replaced by Reserve team manager Jason Pritchard .