John Romero's Daikatana is a first-person shooter video game developed by Ion Storm for Microsoft Windows and Nintendo 64, and released in 2000.

Daikatana is composed of 24 levels (18 in the console versions) divided into four episodes, with a varying number of levels per episode. Each episode represents a different location and time period: 25th century Japan in 2455 AD, ancient Greece in 1200 BC, the Dark Ages in Norway in 560 AD, and near-future San Francisco in 2030 AD.

One element that Daikatana stressed was the important role of Hiro Miyamoto's two sidekicks, Mikiko Ebihara and Superfly Johnson. The death of either sidekick resulted in failing the level, and their assistance was required to complete certain puzzles. Due to poor AI implementation, the sidekicks, who were one of the game's selling points, became a focus of criticism.