Yoshio Sawai (澤井啓夫, Sawai Yoshio, born March 14, 1977 in Toyohashi, Aichi Prefecture) is a Japanese gag manga artist, best known for his series Bobobo-bo Bo-bobo and sequel Shinsetsu Bobobo-bo Bo-bobo, both serialized in Weekly Shōnen Jump.
Sawai made his debut in Weekly Shōnen Jump drawing one shot manga such as Mutekiman and Fierce!!
Because of the nature of his series, he has often written Bo-bobo version parodies of other authors' manga, including Akira Toriyama's Dragon Ball, Yudetamago's Kinnikuman, Kazuki Takahashi's Yu-Gi-Oh!, and Tsugumi Ohba's and Takeshi Obata's Death Note.
He was also the leader of a team of gag-based manga artists (alongside Kyosuke Usuta, Amon Dai and Kouji Ooishi) who wrote a special 30th anniversary chapter of Osamu Akimoto's Kochira Katsushika-ku Kameari Kōen-mae Hashutsujo.
In December 2011 Sawai started a spin-off manga of Don Patch from Bobobo-bo Bo-bobo entitled Fuwari!