Stephen William Badger (born 19 October 1956) is a former competitive swimmer who represented Australia in the 1973 World Swimming Championships and the 1974 Commonwealth Games, and Canada in the 1976 Summer Olympics.

He missed selection in the 1978 Canadian Commonwealth Games team due to a bout of glandular fever.

After representing Australia in the 1973 World Championships and the 1974 Commonwealth Games, he moved to Canada in late 1974.

Whilst competing at the Canadian Olympic Trials Stephen was placed under police protection due to death threats.

After suffering glandular fever in 1978, he returned to international competition, touring Europe in early 1980 with the Canadian national swimming team.