Fighting of World Japan Pro-Wrestling, frequently shortened to World Japan or WJ was a professional wrestling promotion formed in Japan in 2002 by former New Japan Pro-Wrestling employees Riki Choshu and Katsuji Nagashima, who also served as chairmen along with Tomohiro Ishii.

Mitsuo Yoshida , better known by his ring name Riki Choshu , is a South Korean-Japanese retired professional wrestler who is best known for his longtime work in New Japan Pro-Wrestling (NJPW) as both a wrestler and a booker. He is considered one of Japan’s most influential wrestlers for his work in the 1980s and 1990s and is known as the first wrestler to popularize the Sasori-Gatame, better known in English as the Scorpion Deathlock or Sharpshooter. After leaving NJPW in 2002, he formed Fighting World of Japan Pro Wrestling (WJ), but eventually returned to New Japan in October 2005 as a site foreman, booker and part-time wrestler. Choshu once again left NJPW in 2010 and primarily worked in Tatsumi Fujinami’s Dradition, as well as his own self-produced Power Hall events as a freelancer. Choshu was a second generation Zainichi Korean until his naturalization in 2016.