The Ottawa Nationals was the name of several teams in Ottawa, Ontario.

They were a Junior "B" team in the Eastern Ontario Junior B Hockey League in 1966-67. They finished last.

Also in 1966-67 another last place team used the name in the Ottawa St Lawrence Senior League.

In 1968-69 the name was used by the Canadian National B Team based in Ottawa.

The most famous of these teams was the World Hockey Association's Ottawa Nationals that finished in fourth place in the eastern division in 1972-73. For the playoffs the team moved to Toronto where they remained, playing the next season as the Toronto Toros.

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