The Connacht Senior Cup is a knockout competition for Senior rugby union clubs in the Irish province of Connacht, under the auspices of The Connacht Branch IRFU. The Cup has been played for a total of 102 times, with twelve different cubs having won the trophy during that period.
Until 1928 all finals were played at the grounds of the then Galway Grammar School. From 1929 until the present the final is traditionally held at the Galway Sportsground on College Road, Galway.
The winners compete with the other three provincial cup winners for the All-Ireland Cup.