Kato is a Pomo word, meaning "lake", and may have referred to an important Cahto village site, which the Kato tribe themselves called Djilbi. Kato is one of the five sub-dialects of the Wailaki group, one of four Athapascan dialect groups in northwestern California.

Kato is a fictional character from The Green Hornet radio program. This character has also appeared with the Green Hornet in film, television, book and comic book versions as well. Kato was the Hornet's sidekick and had been played by a number of actors including Keye Luke and, in the television series, Bruce Lee.

Kato is a UK band based in Blackpool.

To formally enter a monastery for training. See kashaku.