Abbreviation
- the IOC country code for Monaco
- Member of the Order of the Niger, a Nigerian national honour
- Miscellaneous Organic NESHAP, a US pollution-control standard
- Mixed Oxides of Nitrogen, a type of chemical solution
- Monarch Airlines, UK airline
- Monday, a day of the week
- Monmouthshire, Welsh county and Monmouthshire local government area
- Monoceros, a constellation (group of stars)
- Monon Railroad, a former US railway company
- Monsanto Company genetically modified crops
- MON 810
- MON 863
- Motor octane number, an octane rating for petrol/gasoline
- Music On! TV, Japanese TV channel
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