| William Welply | |
| Nationality: | British |
| Sport: | Sailing |
| Birth Date: | 25 December 1912 |
| Birth Place: | West Ham, England |
| Death Place: | Marylebone, England |
William Welply (25 December 1912 - 24 June 1970) was a British sailor. He competed in the Star event at the 1936 Summer Olympics.[1]