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 and also served with the 4th Division in France and Belgium.