| Tournament details | |
|---|---|
| Country |  Ireland |
The League of Ireland Cup 2005 was the 32nd staging of the League of Ireland Cup.
The 2005 League Cup kicked off in May. A representative team of the Mayo League joined the 22 league clubs in the draw. There were fourteen clubs drawn to face each other in the first round, with the rest given byes to the second round.
Matches played on 30 May and 31 May 2005.
| Tie no | Home team | Score | Away team |
|---|---|---|---|
| 1 | Dublin City | 1–3 | UCD |
| 2 | Dundalk | 2–4 | St Patrick's Athletic |
| 3 | Limerick | 2–2 | Waterford United |
| Waterford United won 4–1 on penalties | |||
| 4 | Bray Wanderers | 0–3 | Shamrock Rovers |
| 5 | Derry City | 2–1 | Mayo League |
| 6 | Monaghan United | 2–0 | Athlone Town |
| 7 | Sligo Rovers | 1–0 | Finn Harps |
Matches played between 20 June and 26 June 2005.
| Tie no | Home team | Score | Away team |
|---|---|---|---|
| 1 | Cork City | 3–0 | Kilkenny City |
| 2 | UCD | 1–0 | Shamrock Rovers |
| 3 | Bohemians | 1–3 | St Patrick's Athletic |
| 4 | Cobh Ramblers | 0–1 | Waterford United |
| 5 | Drogheda United | 2–1 | Monaghan United |
| 6 | Shelbourne | 2–1 | Kildare County |
| 7 | Sligo Rovers | 0–2 | Longford Town |
| 8 | Derry City | 2–1 | Galway United |
Matches played on 4 July and 5 July 2005.
| Tie no | Home team | Score | Away team |
|---|---|---|---|
| 1 | UCD | 1–0 | Waterford United |
| 2 | Shelbourne | 2–1 | St Patrick's Athletic |
| 3 | Cork City | 0–1 | Longford Town |
| 4 | Derry City | 2–2 | Drogheda United |
| Derry City won 5–4 on penalties | |||
| Shelbourne | 1–2 | UCD |
|---|---|---|
Hawkins  85' |
Gannon 90' Martin 90' |
| Derry City | 2–1 | Longford Town |
|---|---|---|
| Farren 42', 48' |
Ferguson 71' |
| UCD | 1–2 | Derry City |
|---|---|---|
| Byrne 40' |
Murphy 14' McWalter 45' (og) |
| League of Ireland Cup Winner 2005 |
|---|
Derry City 6th Title |