Ezo is a Japanese heavy metal band originally formed and known as Flatbacker in Sapporo, Japan

Ezo consisted of Masaki Yamada (vocals), Taro Takahashi (bass), Shoyo Iida (guitar) and Hiro Homma (drums). They released one demo cassette (Minagoroshi) in 1984 and two albums (1985's Senzo and 1986's Esa) in Japan as Flatbacker in the mid-1980s before coming to the U.S. Rumor has it that Gene Simmons of KISS, who produced their self-titled U.S. debut album, was behind the band's name change to EZO, inspired by Eizo, an ancient name for Hokkaido. They released two albums for Geffen Records, 1987's E-Z-O and 1989's Fire Fire, before being dropped from the label and internal differences led to the band's demise.

Vocalist Masaki Yamada joined fellow Japanese metalheads Loudness in 1992 and drummer Hiro Homma joined Loudness in 1994. In 2000, the original Loudness lineup reunited and Masaki and Hiro left the band. Hiro Homma is currently the drummer Japanese metal band Anthem and vocalist Masaki Yamada is working on a solo project.