Grub or GRUB can mean:

• a slang term for food
• a beetle larva that resembles a worm
• the GNU project's Grand Unified Bootloader software: see GRUB
• a distributed commercial search engine: see Grub (search engine)
• a number of places in Switzerland, Austria and Germany, such as:
  • Grub, canton of Appenzell Outer Rhodes, Switzerland
  • Grub, Germany