The abbreviations FM, Fm, and fm may refer to:

Electrical engineering

• Frequency modulation (FM) and its most common applications:
  • FM radio, used primarily to broadcast music and speech at VHF frequencies
  • FM synthesis, a sound-generation technique popularized by early digital synthesizers

Science

• Femtometre (fm), an SI measure of length
• the chemical symbol for Fermium (Fm)
• Ferrous metal, otherwise known as iron

People

• First Minister
• Foreign Minister
• Football manager
• Female

Places

• the Federated States of Micronesia
• Fargo-Moorhead, a metropolitan area of the United States (more commonly abbreviated F-M)

Organizations

• Fannie Mae, a colloquial name for the United States' Federal National Mortgage Association
• Freddie Mac, a similar colloquialism for the United States' Federal Home Loan Mortgage Corporation

Computing

• The .fm country-code top-level domain for the Federated States of Micronesia

Other

• the ISO 3166-1 country code for the Federated States of Micronesia
• Farm to Market Road