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In the fictional Star Wars universe, Ithor is a planet located within the lesser plooriod cluster situated in the Mid Rim sector of the galaxy close to the meridian sector border. The planet was renowned for both the variety and pristine nature of its ecology. The Ithorians themselves, nicknamed "Hammerheads" due to their distinctive physiology, developed massive floating cities so that the planet's surface could remain unscathed. After these cities were developed, it became illegal for an Ithorian to set foot on the surface of the planet unless he remained there permanently. Despite the harsh restrictions tied to such an act, many Ithorians heeded the call of "Mother Nature" and moved from the cities to the forests below.

The surface of the planet of Ithor formerly played host to numerous plants including Indyup trees, Donar flowers bull-ferns and Baffor trees. The "Baffor" tree, which possessed telepathic capabilities and acted as a sort of distributed intellect - the larger the forest was, the higher the collective intellect. At one point, scientists attempted to bond the telepathic capabilities of the Baffor tree with another and more vicious trees appeared on the planet surface. The result was a new parasitic life named "Spore", but its parasitic hostility forced the Ithorians to lock it away in an asteroid, where it was eventually rediscovered by miners. ("Spore", part of the "Galaxy of Fear" Star Wars book series.) The delicate ecosystem also played host to various other life forms including the manollium bird, the shamarok flitter and the arrak snake.

During the invasion of the Yuuzhan Vong, Jedi Knight Corran Horn dueled the leader of the Vong forces, Shedao Shai, with the planet Ithor at stake. Corran won and killed Shedao Shai, but his second-in-command, Deign Lian, answering to Warmaster Tsavong Lah, was ordered to unleash a deadly bacteriological agent on the surface of the planet. The bacteria consumed all organic material on the planet at an incredible rate, leaving behind a black sludge and releasing massive amounts of oxygen and heat into the atmosphere. The planet was then burnt into a cinder when a heavily damaged and burning Yuuzhan Vong cruiser crashed into the planet, setting the entire atmosphere on fire due to the increased oxygen.

The destruction of Ithor, a well known planet in the Star Wars Universe, marked, along with the death of Chewbacca, that the New Jedi Order series would see many changes occurring to the galaxy.