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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