Shirō Sagisu is a Japanese composer, arranger and music producer. With a career spanning over 40 years, he is best known for his works as a record producer for acts including various choir members Mike Wyzgowski, Misia, Satoshi Tomiie, and Ken Hirai. Sagisu has also worked as a film composer for several anime and films, being well known for his collaborations with Gainax, especially in the soundtrack of Hideaki Anno's series Neon Genesis Evangelion.
Sagisu's career in music started in 1977, when he became one of the members of jazz fusion band T-Square. He made three albums with the group before becoming a full-time composer and writer in 1979. By 1997, he had composed over 2,000 songs, advertising jingles and TV and movie pieces. Sagisu won the Tokyo Anime Award for "Best Music" in 2010 for Evangelion: 2.0 You Can Advance. Sagisu arranged a rendition of the Japanese national anthem, "Kimigayo", performed at the 2020 Summer Olympics opening ceremony by Misia.