| FAI Cup | |
| Year: | 1923–24 |
| Country: | Ireland |
| Dates: | 5 January 1924 – 17 March 1924 |
| Num Teams: | 13 |
| Winners: | Athlone Town |
| Count: | 1 |
| Second: | Fordsons |
| Matches: | 13 |
| Goals: | 28 |
| Prev Season: | 1922-23 |
| Next Season: | 1924-25 |
The FAI Cup 1923 - 24 was the third edition of Ireland's premier cup competition, The Football Association of Ireland Challenge Cup or FAI Cup. The tournament began on 5 January 1924 and concluded on 17 March with the final held at Dalymount Park, Dublin. An official attendance of 18,000 people watched Dinny Hannon secure Athlone Town's sole FAI Cup title by defeating Cork side Fordsons.
| Tie no | Home team | Score | Away team | Date | |
|---|---|---|---|---|---|
| 1 | Athlone Town | 2-0 | 5 January 1924 | ||
| 2 | Bohemians | 1-0 | Shamrock Rovers | 5 January 1924 | |
| 3 | Brooklyn | 1-2 | Bray Unknowns | 5 January 1924 | |
| 4 | St James's Gate | 3-2 | Pioneers | 5 January 1924 | |
| 5 | Clifton | 0-2 | Shelbourne United | 3 February 1924 |
| Bye | Fordsons | |
| Bye | Jacobs | |
| Bye | Shelbourne |
| Tie no | Home team | Score | Away team | Date | |
|---|---|---|---|---|---|
| 1 | Bohemians | 1-0 | Bray Unknowns | 19 January 1924 | |
| 2 | Shelbourne | 0-2 | Athlone Town | 19 January 1924 | |
| 3 | Jacobs | 0-2 | Fordsons | 27 January 1924 | |
| 4 | St James's Gate | 2-1 | Shelbourne United | 17 February 1924 |
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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.