The Ottawa Nationals were an ice hockey team based out of Ottawa that played in the World Hockey Association during the 1972-73 WHA season.

The WHA had originally announced a franchise for "Ontario", and there was some expectation that Hamilton would be the team's home, but the franchise was eventually placed in Ottawa.

Their home ice was originally the Ottawa Civic Center, but continuing financial disagreements with the arena's operators resulted in the Nationals moving their playoff games to Toronto. For the 1973-74 WHA season, the team was moved to Toronto where it played as the Toronto Toros.

Defunct ice hockey teams | WHA teams | Sport in Ottawa