The League of Ireland Cup 2004 was the 31st staging of the League of Ireland Cup, which was won by Longford Town, the club's first victory in the competition.
The 2004 League Cup kicked off in May. It featured two teams representing the Kerry and Mayo Leagues plus the 10 teams from the Premier Division and the 12 from the First Division. There was 24 teams drawn into eight groups of three. Each team played the other two in their group. The winner of each group progressed to the quarter-finals.
Matches played between 3 May and 18 May 2004.
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| May 3, 2004 | ||||||
| Cork City | 4–0 | Kerry League | Turners Cross | |||
| May 11, 2004 | ||||||
| Cobh Ramblers | 1–2 | Cork City | St. Colman's Park | |||
| May 18, 2004 | ||||||
| Kerry League | 0–0 | Cobh Ramblers | Mount Hawk Park |
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| May 4, 2004 | ||||||
| Waterford United | 0–0 | Kilkenny City | Regional Sports Centre | |||
| May 11, 2004 | ||||||
| Limerick | 2–2 | Waterford United | Hogan Park | |||
| May 18, 2004 | ||||||
| Kilkenny City | 2–2 | Limerick | Buckley Park |
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| May 3, 2004 | ||||||
| Kildare County | 4–0 | Athlone Town | Station Road | |||
| May 11, 2004 | ||||||
| Longford Town | 2–1 | Kildare County | Flancare Park | |||
| May 18, 2004 | ||||||
| Athlone Town | 0–4 | Longford Town | St. Mel's Park |
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| May 4, 2004 | ||||||
| Derry City | 2–0 | Finn Harps | The Brandywell | |||
| May 11, 2004 | ||||||
| Monaghan United | 1–0 | Derry City | Finn Park | |||
| May 18, 2004 | ||||||
| Finn Harps | 3–0 | Monaghan United | Kingspan Century Park |
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| May 3, 2004 | ||||||
| Galway United | 0–0 | Sligo Rovers | Terryland Park | |||
| May 11, 2004 | ||||||
| Mayo League | 1–1 | Galway United | ||||
| May 18, 2004 | ||||||
| Sligo Rovers | 2–0 | Mayo League | The Showgrounds |
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| May 4, 2004 | ||||||
| Bray Wanderers | 0–1 | UCD | Carlisle Grounds | |||
| May 10, 2004 | ||||||
| Shamrock Rovers | 1–3 | Bray Wanderers | Richmond Park | |||
| May 17, 2004 | ||||||
| UCD | 0–0 | Shamrock Rovers | Belfield Park |
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| May 3, 2004 | ||||||
| St Patrick's Athletic | 1–3 | Dublin City | Richmond Park | |||
| May 11, 2004 | ||||||
| Shelbourne | 3–2 | St Patrick's Athletic | Tolka Park | |||
| May 17, 2004 | ||||||
| Dublin City | 2–1 | Shelbourne | Tolka Park |
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| May 4, 2004 | ||||||
| Dundalk | 0–0 | Bohemians | Oriel Park | |||
| May 10, 2004 | ||||||
| Drogheda United | 4–1 | Dundalk | United Park | |||
| May 17, 2004 | ||||||
| Bohemians | 3–1 | Drogheda United | Dalymount Park |
Matches played between 14 June and 28 June 2004.
| Tie no | Home team | Score | Away team | |
|---|---|---|---|---|
| 1 | Limerick | 2–0 | Cork City | |
| 2 | Sligo Rovers | 1–5 | Finn Harps | |
| 3 | Longford Town | 2–0 | Dublin City | |
| 4 | Bohemians | 2–1 | UCD |
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Ireland