ROM, Rom, or rom may refer to:

• Roma (people), whose members are called Rom (or Gypsy)
• Read-only memory
• Royal Ontario Museum
• Rom (Star Trek), the name of a Ferengi from Star Trek: Deep Space Nine.
• Rom (Spaceknight), a Galadorian spaceknight from the Marvel universe.
• Rome, Italy, called "Rom" in German and Swedish
• Rom, Deux-Sèvres , a commune in the Deux-Sèvres département in France
• Romany language (ISO 639 alpha-2, rom)
• Rough order-of-magnitude