Mount Sion (Irish: Cnoc Sion) is a Gaelic Athletic Association club located in Waterford City, County Waterford, Ireland. It was founded by teachers in the school of the same name. Although technically separate from the school, the club still maintains a close relationship with the school, sharing the same sports facilities in the city. The club fields teams in both the Waterford Hurling and Gaelic football championships and has had many famous players, including , Philly Grimes, Tony Browne and Ken McGrath.