Leagues Alphabetically
- OCJHL — Ottawa City Junior Hockey League
- OCSHL — Ottawa City Senior Hockey League
- OHA — Ontario Hockey Association
- OHA-I — Ontario Hockey Association - Intermediate
- OHA-Jr. — Ontario Hockey Association - Junior A
- OHA-Jr.B — Ontario Hockey Association - Junior B
- OHA-Sr — Ontario Hockey Association - Senior A
- OHL — Ontario Hockey League
- OIHA — Ontario Intermediate Hockey Association
- OJHL — Ontario Junior A Hockey League
- OJHL-B — Ontario Junior B Hockey League
- OJHL-C — Ontario Junior C Hockey League
- OKML — Okanagan Mainline Hockey League
- OMHA — Ontario Hockey Minor Association
- OMHL — Ontario Major Hockey League
- OMJHL — Ontario Major Junior Hockey League
- ONDHL — Ottawa National Defense Hockey League
- OPHL — Ontario Professional Hockey League (1909-1911)
- OPHL — Ontario Professional Hockey League (1930-1931)
- OQAA — Ontario-Quebec Athletic Association
- OSBHL — Ontario Senior B Hockey League
- OSHL — Okanagan Senior Hockey League
- OSrBL — Ontario Senior B Hockey League
- OUAA — Ontario University Athletic Association
- OVHL — Ottawa Valley Hockey League
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