Miscellaneous
- Mr. (artist), a Japanese artist
- Mouvement Réformateur, a Belgian political party
- Marathi language (mr ISO 639-1 code)
- Marginal revenue, an economics term
- MR (Marina and Rainer) (1989), one-act chamber opera by Nikolai Korndorf
- Market researcher, an occupation
- Master of the Rolls, the second most senior judge in England and Wales
- McCune-Reischauer, a system of romanization for the Korean language
- Mileage run, a paid/revenue airline trip solely to gain maximum frequent flyer miles or points
- Mountain rescue
- Mental ray, a 3D rendering application
- Rear mid-engine, rear-wheel drive layout, an automotive design with a mid-mounted engine driving the rear wheels
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