Toshio Mashima (真島 俊夫, Mashima Toshio) (21 February 1949 – 21 April 2016) was a Japanese composer born in Yamagata Prefecture, Japan.First, he studied engineering. He interrupted this to study music. He graduated from the Kanagawa University and took the Yamaha Band Director course, going on to do his major in technology. He also studied music composition under Bin Kanade and jazz theory under Makoto Uchibori. He graduated in 1971 and went on to play trombone in jazz and pop bands. He then worked as an assistant to Naohiro Iwai and began to focus on making compositions for bands.His own works, especially for bands, are published in Europe and sold in America. Lately, he has also composed for TV series and movies. He currently serves as an instructor of the Institute of Education, Sobi, as well as working as a special instructor at the Yamaha Music School.