M105 or M-105 may refer to:
- Messier 105, an elliptical galaxy in the constellation Leo
- M105, a 1½ ton US Army trailer
- M-105 (Michigan highway), a former state highway in Michigan
- Klimov M-105 aircraft engine
- WWWM, a radio station in Cleveland, Ohio now known as WMJI
In athletics:
- Masters athletics, an age group for athletes aged 35+
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