Cube Being is a term originating in Marvel Comics, used to describe a Cosmic Cube which has gained sentience. While that is the most strict definition, it can also be applied to other beings from Marvel or other fiction with a similar level of power. A Cube Being is above Skyfathers but below Celestials.

General characteristics of the power of a Cube Being are:

Universal - level reality warping (complete control of one universe, usually including the ability to destroy/reset it)
- Some multiversal abilities (ability to manipulate extra dimensions and have their influence felt across the multiverse. Not actual multiverse level reality warpers or busters).

Examples of actual Cube Beings in Marvel:

- Kubik
- Kosmos
- The Shaper of Worlds
- Post - Retcon Beyonder
- Post - Retcon Molecule Man

Examples of beings that could be considered Cube Beings based on power (note that there is a rather wide range of power on this list):

- Anti-Spiral and Tengen Toppa Gurren Lagann (TTGL)
- Apollo, Hades, and other Olympians, as well as unsealed Titans and God Saints via their most powerful attacks and power-ups (Saint Seiya)
- Arceus, Dialga, Girantina, and Palkia from Pokemon
- Bernkastel, Lambdadelta (Umineko)
- Blackheart, Dormmamu, Mephisto, Uatu the Watcher, and many others from Marvel Comics
- Cloud of Darkness, Exdeath, Necron, Time Compressed Ultimecia, and several others from Final Fantasy
- Creator God of Light: Horakhty (Yu-Gi-Oh!)
- The Ds (Tenchi Muyo!)
- Eternals, Omega, Chronovores, and several others from Doctor Who
- Giygas (Earthbound/Mother)
- God, Satan, Divine Spawn, and many others from Image Comics
- Stairway to Heaven (given enough time) (Jojo's Bizarre Adventure)
- Haruhi Suzumiya (The Melancholy of Haruhi Suzumiya)
- Imperiex, Superman Prime (implied), Trigon, The Time Trapper, and many others from DC Comics
- Lain Iwakura (Serial Experiments Lain)
- Milleniummon, Moon=Millenniummon, NEO, Omnimon X, and many others from Digimon
- Mobster Kingpin from Problem Sleuth
- Q (Star Trek)
- Shinki (Touhou)
- Solaris (Sonic the Hedgehog)
- Urboros (Xenogears)
- Vector Prime, The Fallen, Nexus Prime, and the rest of the original 13 Transformers from Transformers

Not to be confused with the nearly extinct, much lonelier, and less powerful species, the Cubey.