Masami Tsuchiya (土屋 昌巳) is a Japanese singer-songwriter and musician who came to prominence in the late Seventies as the lead vocalist and guitarist in the group Ippu-Do. His subsequent output includes solo work and collaborations. Tsuchiya has worked with artists as diverse as English new wave rockers Japan and Bill Nelson, Japanese electronica composer Ryuichi Sakamoto, Duran Duran side-project Arcadia, and Japanese rock band Buck-Tick.
In 1982, he wrote the song Bitter Is Better together with Bill Crunchfield, recorded by Kim Wilde for a Japanese commercial and released as a single.
In March 2008, Tsuchiya formed the rock band Vitamin-Q along with Kazuhiko Kato, Gota Yashiki, Rei Ohara and Anza. However, after Kato's suicide on 17 October 2009, the fate of the group is uncertain.
In June 2010, following news of former collaborator Mick Karn's (former Japan bassist) cancer diagnosis, Tsuchiya reunited with former bandmates Gota Yashiki, Vivian Hsu, and Masahide Sakuma (of Japanese new wave group Plastics) and recorded two songs for a proposed September 2010 release to raise funds for Karn and his family. The musicians had recorded together as The d.e.p. in the early 2000s, releasing the album "Shinkei Stop" in 2001.