Jimmy Onishi (ジミー大西, Jimī Ōnishi; born 1 January 1964) is a Japanese painter and comedian. His real name is Hideaki Onishi (大西 秀明, Ōnishi Hideaki), in which his given name is a combination of Hide (秀) from daimyo Toyotomi Hideyoshi and Aki (明) means "bright" which relates to the New Year celebrations as he was born on New Year's Day.

Onishi is represented with Yoshimoto Creative Agency.