Geon may refer to:
- Geon (geology), a time interval
- Geon (physics), a hypothetical gravitational wave packet
- Geon (psychology), a geometrical primitive out of which everyday objects can be represented
- Geon, short for geonim, rabbis in the medieval era
- Geon, a character from the King of the Monsters series of video games
- Geon: Emotions, a video game for Xbox 360's Xbox Live Arcade service
- Geon (video game), for PlayStation 3's PlayStation Network and Nintendo Wii