The Venator-class Star Destroyer, also known as Republic attack cruiser, and later Imperial attack cruiser, was one of the capital ships used extensively by the Galactic Republic Navy during the later parts of the Clone Wars, as well as by the Galactic Empire. It was designed and constructed by Kuat Drive Yards and Allanteen Six shipyards. A stock ship was 1,137 meters long, making it one of the largest capital ships capable of atmospheric operations, landing on planets to load and unload troops and vehicles. The Venator-class was born from the success of the Acclamator-class assault ship and was designed by Lira Blissex for the purpose of serving as a medium-sized, versatile multi-role warship.

The armament of a single Venator-class Star Destroyer consisted of eight dual DBY-827 heavy turbolaser turrets, two medium dual turbolaser cannons, fifty-two point-defense dual laser cannons, and four proton torpedo tubes.
The Venator-class's eight heavy dual turbolaser turrets were its main weapons and had two tracking modes. In its precise, long-range tracking mode, the DBY-827 could hit a target vessel at a range of ten light minutes. During close-range fights, the turrets could rotate in three seconds with their fast-tracking mode. In terms of firepower, these weapons rivaled the main battery on the later Imperial I-class Star Destroyers. At the suggestion of Anakin Skywalker, a heavy SPHA turbolaser cannon was installed within the ventral hangar bay of some Venator-class ships of the Open Circle Fleet. These weapons were meant to protect the Star Destroyers while they opened their long ventral doors to the army complement bays. They would be used to considerable effect during the Battle of Coruscant.
The Venator-class shared some design-characteristics with a warship class that served in the Mandalorian Neo-Crusader fleet during the Mandalorian Wars against the Republic thousands of years before the Clone Wars.
Venator-class Star Destroyers were deployed in many battles during the Clone Wars, most notably during the Battle of Coruscant when upwards of a thousand such ships helped protect the capital, and played pivotal roles in the repulsion of the CIS forces and the rescue of Supreme Chancellor Palpatine. Separatist forces categorized this kind of vessel as Cruiser-class, to contrast the Escort-class designation for smaller vessels, like the Arquitens-class and Consular-class.
These warships were fast enough to pursue blockade runners, while also being large enough to lead independent operations, such as the Battle of Cato Neimoidia, Battle of Kashyyyk, and the Battle of Utapau. They could be used to land troops on planetary surfaces, and serve as escorts for larger battleships, but their primary role was as mainline cruisers and starfighter carriers. As ships of the line, they were often grouped in lines of three to four ships.