| FAI Cup | |
| Year: | 2006 |
| Country: | Republic of Ireland |
| Num Teams: | 42 |
| Champions: | Derry City |
| Runner-Up: | St Patrick's Athletic |
| Matches: | 49 |
| Goals: | 134 |
| Prevseason: | 2005 |
| Nextseason: | 2007 |
The FAI Cup 2006 was the 86th staging of The Football Association of Ireland Challenge Cup or FAI Cup. This season's competition was the last to be sponsored by Carlsberg. 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 League of Ireland clubs. The competition ran until early December, with the final taking place on Sunday, December 3.
Fixtures played weekend April 23
Waterford Crystal 4-1 Garda AFC
Castlebar Celtic 5-1 Fairview CYM
Ashtown Villa 2-2 Wayside Celtic
Tolka Rovers 1-3 Carrigaline United
College Corinthians2-2 Blarney United
Brendanville 0-1 Douglas Hall
Malahide United 1-1 Fanad United
Athenry 0-0 Bangor Celtic
Killester United 6-1 St Mochtas
Crumlin United 0-0 Avondale United
Matches played on the weekend of Sunday, 28 May 2006.
| Tie no | Home team | Score | Away team | |
|---|---|---|---|---|
| 1 | Longford Town | 2-1 | Cork City | |
| 2 | Athlone Town | 2-1 | Galway United | |
| 3 | Bohemians | 3-1 | Waterford Crystal | |
| 4 | Bray Wanderers | 2-2 | Kildare County | |
| replay | Kildare County | 0-1 | Bray Wanderers | |
| 5 | Waterford United | 5-0 | Douglas Hall | |
| 6 | Limerick | 0-0 | Drogheda United | |
| replay | Drogheda United | 0-1 | Limerick | |
| 7 | Dundalk | 1-0 | Cobh Ramblers | |
| 8 | Blarney United | 1-3 | Derry City | |
| 9 | Bangor Celtic | 1-3 | Shelbourne | |
| 10 | Carrigaline United | 0-4 | Sligo Rovers | |
| 11 | Kilkenny City | 0-2 | UCD | |
| 12 | Dublin City | 0-0 | Monaghan United | |
| replay | Monaghan United | 2-4 | Dublin City | |
| 13 | Finn Harps | 1-0 | Crumlin United | |
| 14 | Castlebar Celtic | 0-2 | Shamrock Rovers | |
| 15 | Malahide United | 0-2 | St Patrick's Athletic | |
| 16 | Wayside Celtic | 0-1 | Killester United |
Matches played on the weekend of Sunday, 27 August 2006.
| Tie no | Home team | Score | Away team | |
|---|---|---|---|---|
| 1 | Shamrock Rovers | 1-1 | Bohemians | |
| replay | Bohemians | 0-2 | Shamrock Rovers | |
| 2 | Waterford United | 1-1 | Longford Town | |
| replay | Longford Town | 1-0 | Waterford United | |
| 3 | UCD | 3-1 | Limerick | |
| 4 | St Patrick's Athletic | 2-0 | Dundalk | |
| 5 | Finn Harps | 0-0 | Athlone Town | |
| replay | Athlone Town | 3-2 | Finn Harps | |
| 6 | Sligo Rovers | 2-1 | Bray Wanderers | |
| 7 | Shelbourne | 0-1 | Derry City | |
| 8 | Killester United | w/o | Dublin City |
Matches played on the weekend of Sunday, 1 October.
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The 2006 FAI Cup Final was the last at the old Lansdowne Road.