Earth also called the Samurai Jack World is a planet inhabited by mainly Earthlings, but other races and species also reside on this planet. It is the home of Samurai Jack and the main setting for the entire animated series. It is also the main setting to Genndy Tartakovsky's two series, Primal and Unicorn: Warriors Eternal.

Earth has two types: a Past where Aku doesn't exist, and a Future where Aku conquered Earth and other planets. Fortunately, this Future was averted when Samurai Jack killed Aku in the Past.