Geo- is a prefix derived from the Greek word γη or γαια, meaning "earth", usually in the sense of "ground or land”.

GEO or Geo may also refer to:

Arts, entertainment, and media

  • GEO (magazine), a popular scientific magazine
  • Geo, a fictional character on the Nick Jr. television show, Team Umizoomi
  • Geo (Ninjago), character from Ninjago
  • Geo City, a fictional city in the videogame Raw Danger
  • Geo Stelar, the protagonist in Mega Man Star Force
  • Geo TV, a pay television channel in Pakistan
  • Geo, the name of the main currency used in the videogame Hollow Knight

Brands and enterprises

  • Geo (automobile), a defunct brand of entry-level cars produced by General Motors
  • Georgetown University, abbreviated as Geo. in Bluebook
  • GEO Group, a prison corporation

Computing and science

  • Geo (microformat), a microformat for marking up geographical coordinates in (X)HTML
  • Generative engine optimization, a type of Artificial intelligence optimization
  • Gene Expression Omnibus, or GEO, a National Center for Biotechnology Information database for gene expression
  • GEO 600, a detector for gravitational radiation
  • Geo URI, an IETF proposed standard for making URIs for physical locations
  • Geosynchronous Equatorial Orbit, an orbit used for satellites that remain at a fixed position above the ground

Groups and organizations

  • General Education Officer, the basic rank of teachers of the Ministry of Education in Singapore
  • Group on Earth Observations, an intergovernmental organization
  • Grupo Especial de Operaciones, a special SWAT division of the Spanish police

People

  • Geo Bogza, Romanian poet and essayist
  • Geo Dumitrescu, Romanian poet
  • Geo Rutherford, American artist and TikToker
  • George (given name), commonly abbreviated Geo.
  • Christian Geo Heltboe, Danish comedian known by his middle name

Places

  • Geo (landscape), a creek (inlet) or gulley in the Orkney and Shetland Islands
  • GEO, the IOC country code and three letter country code for Georgia (country), in Eurasia
  • GEO, the IATA code for Cheddi Jagan International Airport
  • Estadio Casas GEO, stadium in Mexicali, Mexico