Nomme Kalju FC U21, commonly known as Nomme Kalju U21, or simply as Kalju U21, is a football club, based in Nomme, Tallinn, Estonia.
Founded as Nomme Kalju II, it is the reserve team of Nomme Kalju, and currently plays in the Esiliiga.
Reserve teams in Estonia play in the same league system as the senior team, rather than in a reserve team league. They must play at least one level below their main side, however, so Nomme Kalju U21 is ineligible for promotion to the Meistriliiga but can play in the Estonian Cup.