1930–31 FAI Cup
The FAI Cup 1930-31 was the tenth edition of Ireland's premier cup competition, The Football Association of Ireland Challenge Cup or FAI Cup. The tournament began on 28 December 1930 and concluded on 9 May 1931 with the final replay held at Dalymount Park, Dublin. An official attendance of 10,000 people watched Shamrock Rovers claim the third of five FAI Cup titles in a row by defeating Dundalk.
First round
| Tie no | Home team | Score | Away team | Date |
| 1 | Cork Bohemians | 3-2 | Drumcondra | 28 December 1930 |
| 2 | Shamrock Rovers | 2-1 | Shelbourne | 10 January 1931 |
| 3 | Cork | 0-0 | Bohemians | 11 January 1931 |
| replay | Bohemians | 1-0 | Cork | 15 January 1931 |
| 4 | Dolphin | 3-2 | Brideville | 11 January 1931 |
| 5 | Dundalk | 4-2 | Jacobs | 11 January 1931 |
| 6 | St James's Gate | 2-2 | Bray Unknowns | 11 January 1931 |
| replay | Bray Unknowns | 4-3 | St James's Gate | 15 January 1931 |
| 7 | St. Vincent's | 1-3 | Edenville | 11 January 1931 |
| 8 | Waterford | 5-3 | Rossville | 11 January 1931 |
Second round
| Tie no | Home team | Score | Away team | Date |
| 1 | Bohemians | 5-1 | Edenville | 7 February 1931 |
| 2 | Dundalk | 3-1 | Cork Bohemians | 8 February 1931 |
| 3 | Shamrock Rovers | 5-1 | Bray Unknowns | 8 February 1931 |
| 4 | Waterford | 2-3 | Dolphin | 8 February 1931 |
Semi-finals
----Replay
Final
Replay
| Winner of FAI Cup 1930-31 |
| Shamrock Rovers 4th Title |