Mount Sion (Irish: Cnoc Sion) is a Gaelic Athletic Association club located in Waterford City, County Waterford, Ireland.

[citation needed] The club fields teams in both the Waterford Hurling and Gaelic football championships and has had many famous players, including John Keane, Philly Grimes, Tony Browne and Ken McGrath.

They have also won 2 Munster Senior Hurling titles, in 1981 with victory over Limerick club South Liberties (3-9 to 1–4) and in 2002 beating Sixmilebridge of Clare (0-12 to 0–10).

The club has produced a number of All Star winning players for Waterford and also two Inter-county hurlers of the year, Tony Browne in 1998 and Austin Gleeson in 2016.

Frankie Walsh was the last Waterford man to lift the Liam McCarthy cup in 1959.