A cubewano is any substantial Kuiper belt object, orbiting beyond about 41 AU and not controlled by resonances with the outer planets.

The odd name is derived from the first trans-Neptunian object found, (15760) 1992 QB1. Later objects were called "QB1-os", or cubewanos.

Objects identified as cubewanos include:

• (15760) 1992 QB1
• 20000 Varuna
• 50000 Quaoar