MF or mf may refer to:
Biology Mossy fiber (disambiguation), in neuroscience Mycosis fungoides, a type of skin disease Myelofibrosis, a chronic clonal malignant disease Methuselah Foundation, a non-profit volunteer organization devoted to anti-aging research Microfibril rosettes, the sites of cellulose microfibril synthesis in plants
Agriculture and transportation Milk fat, on dairy product labels in Canada Master of forestry Massey Ferguson, an agricultural equipment company Mitsubishi Fuso Truck and Bus Corporation, a Japanese manufacturer of trucks and buses Mitsubishi Fuso Truck of America, Inc., a North American subsidiary Xiamen Airlines (IATA airline designator MF) MF or M/F, ship prefix for a motor ferry The prefix for steel-wheel rolling stock on the Paris Metro Mandatory frequency airport, a non-towered airport that requires aircraft to communicate on a published frequency
Computing and telecommunications Mainframe computer MediaFire, a file hosting, file synchronization, and cloud storage service Metafont, a font-definition programming language Mozilla Firefox, a web browser Micro Focus, a software company .mf, Internet top level domain for Saint Martin Multi-frequency, in telephony Medium frequency, radio transmissions between the frequencies of 300 kHz and 3000 kHz
Electronics Megafarad (MF), an SI unit of electric capacitance Millifarad (mF), an SI unit of electric capacitance
Photography Manual focus Medium format (film), a size of camera
Arts, entertainment, and media
Music
Musicians Maynard Ferguson (1928–2006), trumpeter and bandleader MF Doom (Daniel Dumile, 1971-2020), British-born hip hop recording artist MF Grimm (born 1970), hip-hop artist Mylène Farmer (born 1961), Canadian-born French singer and songwriter
Other uses in music Mezzo forte (musical notation), a dynamic marking Melodifestivalen, the Swedish preselection for the Eurovision Song Contest Musical Fidelity, a British high-end audio equipment manufacturer
Television Making Fiends (TV series), an American animated horror comedy Modern Family, an American sitcom Monster Force, a 1994 animated television series "Murder Family", the 2020 premiere episode of Helluva Boss
Video games Metroid Fusion
Literature M/F, a novel by Anthony Burgess m/f: a feminist journal, a British feminist magazine MF Dow Jones News, an Italian financial news agency MF Milano Finanza, an Italian business newspaper Mladá fronta DNES, a Czech newspaper
Places MF, the country code for Saint Martin Mayotte, France (FIPS PUB 10-4 territory code MF)
Finance MF Global (also Man Financial), a former finance company NYSE listed as MF Mutual fund, in finance
Religious institutions MF Norwegian School of Theology, Religion and Society Muslims of France, a religious organization in France
Politics Minority Front, a South African political party Member of the Folketing
Other uses Monday–Friday (M–F), abbreviation for the American workweek Membership function, in control engineering, in fuzzy sets Midfielder, a playing position in association football Motherfucker, an insult
See also Miss Fortune (disambiguation) My Friend (disambiguation)