The FAI Cup 2005 was the 85th staging of The Football Association of Ireland Challenge Cup or FAI Cup. It officially kicked off in late April, when twenty clubs from the junior and intermediate leagues battled it out for the chance to face League of Ireland opposition in the second round. The ten winners of those ties were joined in the second round by the 22 eircom League of Ireland clubs. The competition ran until early December, with the final taking place on Sunday, December 4.

First round

Fixtures played weekend April 24 Lissadel United 3-0 Rockmount St Mary's 1-4 Avondale United Cherry Orchard 0-0 Belgrove Bangor Celtic 1-2 Wayside Celtic Douglas Hall 2-0 Moyle Park Mount Merrion 2-2 Galway Hibernians St Peter's (Athlone) 0-0 Carew Park Waterford Crystal 2-0 Bonagee United Westport United 1-2 Fanad United Malahide United 3-2 Glenmore / Dundrum

Replays

Belgrove 1-2 Cherry Orchard Galway Hibernians 0-0 Mount Merrion (3-0 pen) Carew Park 3-2 St Peter's, Athlone

Second round

Matches played on the weekend of Sunday, 12 June 2005.

Third round

Matches played on the weekend of Sunday, 28 August 2005.

Quarter-finals

Semi-finals

Final