Jak II is an open world platform third-person shooter action-adventure video game developed by Naughty Dog and published by Sony Computer Entertainment for the PlayStation 2. It is the second game of the Jak and Daxter series and is the sequel to Jak and Daxter: The Precursor Legacy. It was followed by Jak 3 a year later.

The game features new weapons and devices, new playable areas, and a storyline that picks up after the events of The Precursor Legacy. The player takes on the dual role of protagonists Jak and Daxter.

Jak II takes place in the same fictional universe created by Naughty Dog for Jak and Daxter, though five hundred years after the events of the first game. The game largely revolves around Haven City, a dystopia ruled by Baron Praxis and his Krimzon Guard law enforcers. Haven City serves as the game's hub location, although the player is frequently given tasks that must be fulfilled outside of the city.