Gemini (/'dʒɛmənaɪ/) (Latin for twins) may refer to:

  • Gemini (constellation), one of the constellations of the zodiac
  • Gemini (astrology), an astrological sign
  • Gemini (Chinese astronomy)
  • Gemini twins, Castor and Pollux of Greek mythology
  • Project Gemini, the second U.S. manned spaceflight program
  • Gemini Observatory, an astronomical observatory consisting of telescopes in the Northern and Southern Hemispheres

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