| Country: | Republic of Ireland |
| FAI Cup | |
| Year: | 1930–31 |
| Winners: | Shamrock Rovers |
| Count: | 4 |
| Goals: | 73 |
| Matches: | 19 |
| Prev Season: | 1929-30 |
| Next Season: | 1931-32 |
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.
| 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 |
| 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 |
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A. From 1923 to 1936, the FAI Cup was known as the Free State Cup.
B. Attendances were calculated using gate receipts which limited their accuracy as a large proportion of people, particularly children, attended football matches in Ireland throughout the 20th century for free by a number of means.