| Office: | Lord Mayor of Dublin |
| Term Start: | 1908 |
| Term End: | 1909 |
| Predecessor: | Joseph Nannetti |
| Successor: | William Coffey |
| Death Date: | 19 March 1915 |
| Death Place: | Dublin, Ireland |
| Party: | Irish Parliamentary Party |
Gerald O'Reilly (died 19 March 1915)[1] was an Irish Parliamentary Party politician. He was a member of Dublin Corporation, and served as Lord Mayor of Dublin from 1908 to 1909.[2]
O'Reilly was a Dublin wine and spirits merchant, He was a member of Dublin Corporation for more than 30 years until his death. In 1905 he was appointed Sheriff of Dublin City.