| William Ernest Tummon | |
| Birthname: | William Ernest Tummon |
| Birth Date: | 1879 2, df=yes |
| Birth Place: | Huntingdon Township, Ontario, Canada |
| Spouse: | Ethel M. Finley m. 12 October 1915[1] |
| Riding: | Hastings South |
| Predecessor: | riding created |
| Successor: | John Charles Alexander Cameron |
| Term Start: | October 1925 |
| Term End: | October 1935 |
| Profession: | Contractor, farmer |
| Party: | Conservative |
William Ernest Tummon (6 February 1879 - 14 December 1960) was a Conservative member of the House of Commons of Canada. He was born in Huntingdon Township, Ontario in Hastings County and became a contractor and farmer.
Tummon attended public and secondary school in Hastings County. He was a councillor at Huntington Township for 14 years and a reeve there for five years.
He was first elected to Parliament at the Hastings South riding in the 1925 general election then re-elected in 1926 and 1930. Tummon was defeated by John Charles Alexander Cameron of the Liberal party in the 1935 election.