| Ernest Frederick Armstrong | |
| Term Start: | 1925 |
| Term End: | 1926 |
| Predecessor: | Created from Nipissing and Timiskaming ridings |
| Successor: | Malcolm Lang |
| Birth Date: | July 14, 1878 |
| Birth Place: | Flesherton, Ontario, Canada |
| Death Date: | March 14, 1948 |
| Profession: | dental surgeon |
| Party: | Conservative |
| Riding: | Timiskaming South |
Ernest Frederick Armstrong (July 14, 1878 – March 14, 1948) was a Canadian politician, soldier and dental surgeon. He was elected to the House of Commons of Canada in the 1925 election as a Member of the Conservative Party of Canada representing the riding of Timiskaming South. He was defeated in the 1926 election.
Born in Flesherton, Ontario, Canada, Armstrong served during World War I as a commanding officer for 159th Battalion, Canadian Expeditionary Force and the 197th Regiment and also served with the 4th Division in France and Belgium.