Asociația Club Sportiv Mostiștea Ulmu, commonly known as Mostiștea Ulmu, or simply as Ulmu, is a Romanian football club based in Ulmu, Călărași County. Founded in 2005 as Phoenix Ulmu, the club situated on the banks of Mostiștea Lake reached the third tier on four occasions, a 2nd place being their best ranking. Mostiștea is currently playing in the Liga III.