Jun Watanabe (渡辺 純, Watanabe Jun, born 20 July 1954, in Tokyo) is a Japanese architect and a former professor at Chubu University (until 2009).
His work experiences include Kenzo Tange & URTEC (1978–81), I.M.Pei & Partners (1983–85), and Maki and Associates (1985–90).
After completing the award-winning Makuhari Messe as a project architect with Maki & Associates, he was appointed as an assistant professor of architecture at the University of Texas at Austin in 1990, where he received the tenure professorship in 1996.
In 2003 he received the gold medal, Residential/ Interior category of Bienal Miami + Beach 2003, with his work of Villa Gamagori.
In 2011 he received the Good Design Award, with his work of Hiroo Flat.