William Shanahan should not be confused with Bill Shanahan.
| William Shanahan | |
| Nationality: | Irish |
| Sport: | Athletics |
| Event: | Decathlon |
| Birth Date: | 22 March 1897 |
| Birth Place: | Kilcarney, County Tipperary, Ireland |
| Death Place: | County Tipperary, Ireland |
William Shanahan (22 March 1897 - 29 May 1954) was an Irish athlete.[1] He competed in the men's decathlon at the 1924 Summer Olympics.[2]