Geonosis is a fictional planet from Star Wars Episode II: Attack of the Clones. It is the home planet of the Geonosians, one of the founding worlds and the first homeworld of the Confederacy of Independent Systems, and the site of the Battle of Geonosis. Geonosis is ruled by Poggle the Lesser,the Geonosian archduke.

The planet was located less than one parsec from Tatooine. In many ways the planet was similar to Tatooine, as in that it was a rocky, desert world. One notable difference was that the planet had large and dense rings in orbit. When Jango Fett was being chased by Obi-Wan Kenobi he went into the rings in order to lose Kenobi amongst the rocks that made up the belt.

Geonosis was home to several droid construction facilities, which engineered pink-hued battle droids until the Battle of Geonosis. In addition, it was the first planet to create Super Battle Droids, the more powerful sucssesor to the battle droid.

Much of the planet's architechure consists of domes and buildings built into caverns and rock spires, that look similar to termite mounds. Its most dangerous creatures are massiffs, dog-like lizards that, in every book they are mentioned in, seem to have a tendency to fall off of cliffs. In addition to these, Geonosians keep larger creatures in captivity for use in their arenas. Examples include Acklays, Reeks, and others.

After the Separatist defeat at the Battle of Geonosis, the planet was occupied by the Republic.