Space

• Gemini (constellation), one of the constellations of the zodiac
  • Gemini in Chinese astronomy
• Project Gemini, the second US crewed spaceflight program
• Gemini Observatory, consisting of telescopes in the Northern and Southern Hemispheres
• Gemini Planet Imager, an instrument for observing extrasolar planets

Computing

• Gemini (chatbot), a chatbot developed by Google
  • Gemini (language model), a multimodal large language model from Google
• Gemini (protocol), an Internet protocol providing access to primarily textual documents in Gemini space
• SCO Gemini, a UnixWare/OpenServer merger project by SCO
• Gemini chip, an updated version of the Apple Computer chip Mega II
• Xiaomi Mi 5 (codename Gemini), an Android phone
• Gemini PDA, an Android/Linux PDA/phone with a keyboard
• Yahoo! Gemini, a former name of the online advertising platform Yahoo! Native

Other technology

• Gemini (submarine communications cable), a former subsea cable connecting the US and UK
• Gemini house, a prototype solar-energy house in Austria
• Coleco Gemini, a clone of the Atari 2600 game system

Comics and literature

• Gemini (DC Comics), a fictional supervillain
• Gemini (Marvel Comics), a fictional character
• Gemini, a comic series created by Jay Faerber
• Gemini Kanon, a fictional character in the manga Saint Seiya by Masami Kurumada
• Gemini Saga, a fictional character in the manga Saint Seiya by Masami Kurumada
• Gemini (magazine), a Norwegian periodical
• Gemini, a 2000 novel by Dorothy Dunnett
• Gemini (Les Météores), a 1975 novel by Michel Tournier
• Gemini: An Extended Autobiographical Statement on My First Twenty-five Years of Being a Black Poet, a 1971 publication by Nikki Giovanni

Film

• Gemini (1999 film) (Sôseiji), a Japanese horror film
• Gemeni (film), a 2002 Indian Telugu film also known as Gemini
• Gemini (2002 film), an Indian Tamil film starring Vikram and Kiran Rathod
• Géminis, a 2005 Argentinian film
• The Gemini, a 2016 Burmese LGBT film
• Gemini (2017 film), an American mystery thriller film

Music

Television

• "Gemini" (Law & Order: Criminal Intent), a television episode
• "Gemini" (Stargate SG-1), a television episode
• "Gemini", an episode of Nowhere Man
• Gemini, a fictional villain in the animated series Thundarr the Barbarian
• Gemini Awards, a Canadian television broadcasting award
• Gemini News, an Indian news channel
• Gemini TV, a Telugu-language Indian television channel
• Gemini Stone, a fictional character from Sabrina: The Animated Series
• Gemini, a two-part "clusterbot" from Robot Wars
• Gemini, Myke Horton's Gladiator name on American Gladiators

Other media

• Gemini (play), by Albert Innaurato
• Gemini FM, a South-West England radio station

Aeronautic

• FreeX Gemini, a German two-place paraglider design
• Gemini Air Cargo, a US airline
• Gemini Powered Parachutes, an American aircraft manufacturer
• Gemini Twin, an American powered parachute design
• New Powerchutes Gemini, a South African powered parachute design
• Air Gemini, an Angolan airline
• Marsden Gemini, a research glider
• Miles Gemini, a British 1940s four-seat aircraft

Automotive

• Isuzu Gemini, a car built by Isuzu
• Holden Gemini, a car derived from the Isuzu model
• Gemini (racing car), series of racing cars built between 1959 and 1963
• Gemini, a development-stage codename for the 200Tdi Land Rover engine
• Wright Gemini (disambiguation), a series of bus bodywork designs
• Chevrolet Gemini small-block engine, a high-performance engine built by General Motors

Nautical

• Cape Cod Gemini, an American sailboat design
• MV Gemini, a cruise ship