Joji Kato (加藤条治, Katō Jōji) (born 6 February 1985) is a Japanese speedskater whose specialty is in the sprinting distance event of 500 metres.

Until 9 March 2007 he was the world record holder with the 34.30 he skated in Salt Lake City on 19 November 2005.

Prior to that 500 metre race, he named three skaters as his toughest competition: Jeremy Wotherspoon of Canada, Joey Cheek of the United States, and Dmitry Dorofeyev of Russia.

Cheek and Dorofeyev won gold and silver, respectively, while Kato finished in sixth place.

He represented Japan at the 2010 Winter Olympics in Vancouver where he won bronze at men's 500 metres.