The Kaleesh were a sentient species from the Wild Space world of Kalee. The most notorious member of the species, General Grievous, fought as the Supreme Martial Commander of the Separatist Droid Armies during the Clone Wars.

A species of red-skinned humanoid reptilians from the planet Kalee in Wild Space, the Kaleesh had two yellow eyes with slit pupils. Although all of their facial features were reminiscent of bats, such as their elongated ears and flat noses, the Kaleesh usually wore masks carved from the skulls and bones of either a Mumuu or Erkush, while they use a karabbac–blood as war paint lines above their eyes. They were digitigrades, walking on their toes rather than their entire feet, and they possessed a brain, a heart, and lungs. Their internal organs were extremely flammable.

One of the species’ most well-known members was GeneralGrievous, who was also regarded as its most infamous. His mostly cybernetic body eliminated almost any resemblance to other Kaleesh. As the Supreme Commander of the Separatist Droid Army, he fought in the Clone Wars until he was killed by Jedi GeneralObi-Wan Kenobi during the Battle of Utapau. The DelphidianpirateSidon Ithano wore a Kaleesh mask.