Toshi may refer to:
- TOSHI, a fourth-generation cross-platform game engine
- Toshi (given name), people with the given name Toshi
- Toshi (musician) (Toshimitsu Deyama, born 1965), a Japanese singer and musician
- Toshi Sabri, an Indian singer
- Toshi (American Dad), a recurring character in the show American Dad!
, known exclusively by his stage name Toshi, is a Japanese singer and songwriter. He is best known as the lead vocalist and a co-founder of the heavy metal band X Japan, which disbanded in 1997. Toshi then went on to have an extensive solo career. In 2007, X Japan reunited and began an ongoing world tour in 2010. His distinctive, impassioned tenor vocals have been compared to those of Steve Perry.