Motoharu Yoshizawa (吉沢元治) (1931 – September 12, 1998) was a Japanese bassist and composer known for playing in a distinctive free jazz and free improvisation style, sometimes deploying electronics and using the unusual self-designed five-string bass he referred to as the "Tiritack".
Yoshizawa collaborated with innumerable musicians over his long career; some of the better known include Masayuki Takayanagi, Masahiko Togashi, Takehisa Kosugi, Mototeru Takagi, Kaoru Abe, Steve Lacy, Dave Burrell, Derek Bailey, Evan Parker, Barre Phillips, Butch Morris, Elliott Sharp, Ikue Mori, Keiji Haino, Kan Mikami, Kazuki Tomokawa, Christopher Yohmei Blasdel & Tenko.