The Blaxnit Cup, is a defunct club football competition which featured teams from both football associations on the island of Ireland, in a similar format to the later Setanta Cup.

[1] The competition was sponsored by Blaxnit, a sock and hosiery manufacturer based in Newtownards.

The competition featured four teams from each league.

The Blaxnit Cup was the third cross-border competition.

The tournament suffered from lack of interest and security concerns.