Leagues Alphabetically
- MAHA — Manitoba Amateur Hockey Association
- Man-Pro — Manitoba Professional Hockey League
- MASHL — Mass-Amateur Senior Hockey League
- MBAHL — Metropolitan Boston Amateur Hockey League
- MBHL — Montreal Banking Hockey League
- MBSHL — Metropolitan Boston Senior Hockey League
- MCBHL — Montreal City Bank Hockey League
- MCHL — Montreal City Hockey League
- MCIHL — Moncton City Industrial Hockey League
- MCJHL — Montreal City Junior Hockey League
- MCSHL — Montreal City Senior Hockey League
- MHA-I — Manitoba Hockey Association - Intermediate
- MHL-Sr — Manitoba Senior Hockey League
- MIAA — Maritime Intercollegiate Athletic Union
- MIAU — Michigan Intercollegiate Athletic Union
- MIHA — Manitoba Intermediate Hockey Association
- MIHL — Maritime Independant Hockey League
- MIPHL — Manitoba Inter-Provincial Hockey League
- MISHL — Moncton Inter-Scholastic Hockey League
- MJHL — Manitoba Junior Hockey League
- MJJHL — Moose Jaw Junior Hockey League
- MJrHL — Maritime Junior Hockey League
- MMHL — Maritime Major Hockey League
- MMJHL — Metropolitan Montreal Junior Hockey League
- MMRHL — Montreal Mount Royal Hockey League
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