MF or mf may refer to:

  • Master of Forestry
  • M/F, a novel by Anthony Burgess
  • MF Milano Finanza, an Italian business newspaper
  • MF Dow Jones News (MF-DJ), an Italian financial news agency
  • Mladá fronta DNES, a Czech newspaper
  • Methuselah Foundation, a non-profit volunteer organization devoted to anti-aging research
  • MF Poe, an American artist
  • Melton Foundation, an intercultural organisation registered in Virginia, United States
  • MF Global, formerly known as Man Financial, a failed global financial derivatives broker whose NYSE ticker symbol was MF before it was delisted.
  • Micro Focus, a software company headquartered in Newbury, England
  • Mitsubishi Fuso Truck and Bus Corporation, a Japanese manufacturer of trucks and buses
  • Mitsubishi Fuso Truck of America, Inc., a North American subsidiary of MFTBC, above
  • Xiamen Airlines IATA airline designator
  • Massey Ferguson, a manufacturer or agricultural equipment
  • Mutual fund, in investing
  • Mick Foley, a retired professional wrestler
  • Midfielder, a playing position in association football
  • Mylène Farmer, a Canadian-born French singer and songwriter
  • Maynard Ferguson, a former world-class trumpeter
  • Melodifestivalen, the Swedish preselection for the Eurovision Song Contest
  • Mezzo-forte, a musical dynamic range (Italian for "medium-strong")
  • "Metal Face" Doom (Daniel Dumile), an American hip-hop artist
  • "Mad Flows" Grimm, a hip-hop artist
  • Mainframe, in computing
  • METAFONT, a programming language for defining vector fonts using geometric equations
  • Mozilla Firefox (rarely used)
  • #MF, Math Fault, one of the hardware exceptions in the x86 architecture.
  • Mediafire.
  • Saint Martin ISO 3166-1 alpha-2 country code
    • .mf, the country code top level domain (ccTLD) for Saint Martin
  • Mayotte FIPS PUB 10-4 territory code
  • Mandatory frequency for traffic advisories at an airport
  • Manual focus, a feature of an optical system that allows the user to obtain and maintain correct focus on a target manually
  • Medium format (film), a size of camera usually using 6 cm-size 120-type roll film
  • MF Norwegian School of Theology, Det teologiske Menighetsfakultet in Norwegian
Science and technology
  • Mossy fiber, in neuroscience
  • Myelofibrosis, a chronic clonal malignant disease
  • Prefix for steel rolling stock on Paris Métro (e.g. MF 67, MF 77, MF 88 and MF 2000)
  • millifarad (mF), an SI unit of electric capacitance
  • Megafarad (MF), an SI unit of electric capacitance
  • Medium frequency, radio transmissions between the frequencies of 300 kHz and 3000 kHz
  • Multi-frequency, in telephony
  • Mycosis fungoides, a type of skin disease
  • Monster Force, a 1994 animated television series
  • Power Rangers: Mystic Force
  • Making Fiends
  • Modern Family
Internet language
  • Motherfucker, an insult