Mo

Mo or MO may refer to:

Arts, entertainment, and media

Mo (Oz), a fictional country in the book The Magical Monarch of Mo by L. Frank Baum
Mo, a girl in the Horrible Histories TV series
Mo, also known as Mortimer, a fictional character in the novel Inkheart by Cornelia Funke
Mo, a fictional character in the webcomic Jesus and Mo
Mo, the main character in the fictional Mo's Mischief series
Mo, an ophthalmosaurus from The Land Before Time franchise
MO (Maintenance Operator), a fictional robot character in the Filmation series Young Sentinels
M-O (Microbe Obliterator), a fictional robot character in film WALL-E
Mo the clown, a character played by Roy Rene, 20th-century Australian stage comedian
Mo Harris, a fictional character in the BBC soap opera EastEnders
Little Mo Mitchell, a fictional character in the BBC soap opera EastEnders

Altria Group, formerly Philip Morris (New York Stock Exchange symbol MO)
Calm Air (IATA airline designator MO), an airline based in Thompson, Manitoba, Canada
Milicja Obywatelska, a state police institution in Poland from 1944–1990

Mo (divination), a traditional Tibetan Buddhist technique of divination
Mo (religion), an animist religion of the Zhuang people of China
Modern Orthodox Judaism, a movement that attempts to synthesize Orthodox Jewish values with the secular world

.mo, country code top level domain of Macau
Magneto-optical drive (magneto-optical storage), a data storage medium
Microsoft Office, an office software suite
Mode of operation, in encryption block ciphers
Motivating operation, a term describing the effectiveness of consequences in operant conditioning

Mo (grist mill) (磨), ancient Chinese stone implements used to grind grain into flour
Manual override, a mechanism wherein control is taken from an automated system and given to the user
Metalorganics, also known as organometallics, in chemistry and materials science
Molecular orbital, a mathematical function describing the wave-like behavior of an electron in a molecule
Molybdenum (symbol Mo), a chemical element
Momentary open (MO), a group of electrical switches
Yamaha MO, a music synthesizer

MO-class small guard ship, a class of small ships produced before and during World War II for the Soviet Navy
Morris Oxford MO, an automobile produced by Morris Motors of the United Kingdom from 1948 to 1954

Mo (Chinese zoology), a name that semantically changed from "giant panda", to "a mythical chimera", to "tapir"
Modus operandi (abbreviation m.o.), Latin meaning "mode of operation"; distinctive behavior patterns of an entity
Month (abbreviation mo.), a unit of time of approximately 30 days
Operation Mo, or the Port Moresby Operation, a Japanese plan to take the Australian Territory of New Guinea during World War II