Gaster may refer to:
- the Greek for "stomach"
- a surname, Gaster (surname)
- a Swiss toponym, see Gaster (district)
- W. D. Gaster, a secret character in the video game Undertale
- Dr. Weed Gaster, the protagonist in the video game Dr. Weed Gaster.
- Gaster, the main villain in PaRappa the Rapper anime
|This disambiguation page lists articles associated with the title Gaster.
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- The Danish word for crew member on a boat - "Gast"