1965–66 OHA season

This is a list of OHA standings and season-by-season summaries of the Ontario Hockey Association's Junior A division from 1933 to 1972, and its Tier I division from 1972 to 1974.

The Toronto St. Michael's Majors won the J. Ross Robertson Cup.

Group Semi-finals

Group Finals

Semi-final

Robertson Cup Finals

OHA Grand Championship

The Kitchener Greenshirts won the J. Ross Robertson Cup.

Group Semi-finals

Group Finals

Semi-final

Robertson Cup Final

Quarter-final

Semi-final

Final

The West Toronto Nationals won the J. Ross Robertson Cup.

Group Semi-finals

Group Finals

Semi-final

Robertson Cup Final

The Toronto St. Michael's Majors won the J. Ross Robertson Cup.

Group Semi-finals

Group Finals

Robertson Cup

The Oshawa Generals won the J. Ross Robertson Cup.

The league is split into two divisions. Guelph Indians join the league. The Oshawa Generals won the J. Ross Robertson Cup.

The league drops its divisions. Toronto St. Michael's Majors drop out of the league. Toronto Lions drop out of the league. University of Toronto Varsity Blues drop out of the league mid-year. The Oshawa Generals won the J. Ross Robertson Cup.

Toronto Young Rangers are renamed Toronto Bowles Rangers. Guelph Indians become Guelph Biltmore Mad Hatters. The Oshawa Generals won the J. Ross Robertson Cup.

The Toronto Bowles Rangers revert to being the Toronto Young Rangers. The Toronto St. Michael's Majors re-join the league. The Brantford Lions join the league. The Toronto Native Sons drop out halfway through the season, and declare all their games forfeit. The Oshawa Generals won the J. Ross Robertson Cup.

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