Jak II is an action-adventure video game developed by Naughty Dog and published by Sony Computer Entertainment for the PlayStation 2 in 2003. It is the second game of the Jak and Daxter series and a sequel to Jak and Daxter: The Precursor Legacy. It was followed by Jak 3 the following year in 2004.

The game puts higher emphasis on combat than its predecessor; new weapons, devices and playable areas are available. The player takes on the dual role of protagonists Jak and Daxter.

Jak II received critical acclaim upon release. Critics applauded the game for being very polished in nearly every department, with many agreeing it was one of the best PlayStation 2 games released at the time. Some criticism, however, was directed at the checkpoint systems, darker tone, and high difficulty.