| Office: | Lord Mayor of Dublin |
| Term Start: | 1979 |
| Term End: | 1980 |
| Predecessor: | Paddy Belton |
| Successor: | Fergus O'Brien |
| Birth Place: | Dublin, Ireland |
| Party: | Labour Party |
William Cumiskey was an Irish Labour Party politician.
He was a member of Dublin City Council for the North Inner City electoral area from 1967 to 1985. Cumiskey held the office of Lord Mayor of Dublin from 18 June 1979 to the end of June 1980.[1]
When he was elected mayor, he won 27 votes against Eugene Timmons, who received 13 votes, and Seán Dublin Bay Rockall Loftus, who received 4 votes.[2]
He stood unsuccessfully as a Labour Party candidate at the 1969 general election for Dublin North-Central.[3] He was also unsuccessful at the 1973 general election for the same constituency.[4]