| William Henry O'Sullivan | |
| Office: | Member of Parliament for County Limerick |
| Term Start: | 31 January 1874 |
| Term End: | 24 November 1885 |
| Predecessor: | Edward John Synan William Monsell |
| Alongside: | Edward John Synan |
| Successor: | Constituency abolished |
| Birth Date: | 1829 |
| Nationality: | Irish |
| Party: | Home Rule League |
William Henry O'Sullivan (1829 – 27 April 1887) was an Irish Home Rule League politician.
He was elected as a Home Rule Member of Parliament (MP) for County Limerick in 1874 and held the seat until it was abolished in 1885.[1]