An HMO is a health maintenance organization, an organization that provides or arranges managed care.

HMO or hmo may also refer to:

Codes

  • IATA code for Hermosillo International Airport, in Hermosillo, Mexico
  • ISO 639 code for Hiri Motu language, an official language of Papua New Guinea

Science

  • Hermanus Magnetic Observatory, the former name of SANSA Space Science, South Africa
  • Hückel molecular orbital method, a simple method for the determination of electron energies
  • Human milk oligosaccharide, a family of structurally diverse unconjugated glycans
  • Methyl orange (HMo), an acid–base indicator

Others

  • House in multiple occupation, a residential building housing unrelated people