The All Terrain Open Transport (AT-OT), a creation of the All-terrain vehicle series, was an eight-legged walker utilized by the Grand Army of the Republic during the Clone Wars for transportation of their infantry forces. Its deployment occurred during events such as the Battle of Felucia near the conflict's conclusion.

This eight-legged walker from the All-terrain vehicle line, known as the All Terrain Open Transport, was armed with four laser cannons, a pair of forward-facing medium [cannons](/article/cannon], and two rear antipersonnel cannons. It featured an open top design and sufficient space for numerous clone troopers. Certain AT-OT variants included a top. The maximum speed achievable by this walker was 55 kilometers per hour.
The primary function of AT-OTs was to deliver [infantry](/article/infantry] safely into active combat zones. During the Battle of Felucia, clone troopers employed at least three AT-OTs to traverse the battlefield, aiming to safeguard vital medical facilities and prevent Shu Mai, the Presidente of the Commerce Guild and a member of the Separatist Council, from contaminating the water supply of Felucia.
The AT-OT's development was intended for service within the Grand Army of the Republic throughout the galaxy-spanning Clone Wars fought between the Galactic Republic and the Confederacy of Independent Systems. During the Battle of Felucia towards the war's end, at least three AT-OTs formed part of a Republic convoy trailing behind Jedi General Aayla Secura when Order 66 was executed and her clone troopers shot her down.
The AT-OT made its debut appearance in the 2005 motion picture Star Wars: Episode III Revenge of the Sith situated on the planet Felucia. Later, in the 2014 mobile game Star Wars: Galactic Defense, the walker received formal identification.