1979–80 OMJHL season

The 1979–80 OMJHL season was the sixth and final season of the Ontario Major Junior Hockey League. Twelve teams each played 68 games. The Peterborough Petes won the J. Ross Robertson Cup, defeating the Windsor Spitfires. After the season's end, the league would be renamed to the Ontario Hockey League.

Sudbury Wolves defeat Kingston Canadians 3–0

Niagara Falls Flyers defeat London Knights 3–2

Ottawa 67's defeat Oshawa Generals 4–3

Peterborough Petes defeat Sudbury Wolves 4–3

Brantford Alexanders defeat Toronto Marlboros 4–0

Windsor Spitfires defeat Niagara Falls Flyers 4–1

Peterborough Petes defeat Ottawa 67's 4–0

Windsor Spitfires defeat Brantford Alexanders 4–3

Peterborough Petes defeat Windsor Spitfires 4–0

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