David Scott Armstrong (born July 9, 1966) is a Canadian politician, who was elected as a Conservative member to represent the electoral district of Cumberland—Colchester—Musquodoboit Valley in the federal by-elections on November 9, 2009.
He served until his defeat in the 2015 election.
After his defeat in the 2015 election, Armstrong was appointed as the official opposition critic on Atlantic Canadian issues and ACOA and is the only official opposition critic who is not a member of parliament.On September 15, 2016, it was announced that Armstrong would be returning to full-time teaching and would relinquish his posts with the Conservative Party.