- By decree 127 of the Ministry of Education, the Onomichi Municipal Preparatory School is approved.
- The school is reclassified from a municipal to a prefectural school and reformed as Hiroshima Prefectural Onomichi Junior High School.
- The school is reformed as "Hiroshima Prefecture Onomichi High School." A junior high school is set up as an annex to Onomichi High School.
- Hiroshima Prefecture ordinance 45 renames the school as “Onomichi Kita (North) High School”.
- The Makimine assembly hall was founded as the 50th anniversary school project.
- The coordination between Onomichi Higashi and Kita High Schools is discontinued and is reformed into an integrated(elective)-course high school.
Onomichi Junior High School
- 1st principal : YOSHIMOTO Sakichi (Apr. 1925-Mar. 1936)
- 2nd principal : MATSUMOTO Tadashi (Apr. 1936-Des. 1938)
- 3rd principal : HORI Hideyoshi (Jan. 1939-Feb. 1946)
- 4th principal : ARIMA Seiichiro (Feb. 1946-May. 1948)
Onomichi High School
- 1st principal: ARIMA Seiichiro (May. 1948-Apr. 1949)
Onomichi Kita High School
- 1st principal : SUGIMURA Nobushige (May. 1949-Mar. 1953)
- 2nd principal : MATSUURA Muneyoshi (Apr. 1953-Mar. 1956)
- 3rd principal : KAINO Roku (Apr. 1956-Mar. 1959)
- 4th principal : MASUDA Tadao (Apr. 1959-Mar. 1963)
- 5th principal : KIMURA Tokitaro (Apr. 1963-Mar. 1967)
- 6th principal : UTSUMI Chojiro (Apr. 1967-Mar. 1970)
- 7th principal : SAKUDA Tsuyoshi (Apr. 1970-Mar. 1975)
- 8th principal : SAIMI Tetsuji (Apr. 1975-Mar. 1978)
- 9th principal : TOMONARI Satoshi (Apr. 1978-Aug. 1981)
- 10th principal : YOSHIHIRA Kazutami (Sep. 1981-Mar. 1984)
- 11th principal : WADA Tatsukuni (Apr. 1984-Mar. 1989)
- 12th principal : OKADA Yutaka (Apr. 1989-Mar. 1990)
- 13th principal : KUDO Hidekage (Apr. 1990-Mar. 1994)
- 14th principal : KUROSE Yasuhiro (Apr. 1994-Mar. 1999)
- 15th principal : KOCHIGAMI Kiyotaka (Apr. 1999-Mar. 2001)
- 16th principal : SUNADA Katsuhiko (Apr. 2001-Mar. 2004)
- 17th principal : FUJIWARA Toru (Apr. 2004-Mar. 2006)
- 18th principal : HIWADA Yoshiaki (Apr. 2006-Mar. 2008)
- 19th principal : WATANABE Masanori (Apr. 2008-Mar. 2010)
- 20th principal : OKUDA Hirohisa (Apr. 2010-Mar. 2015)
- 21st principal : YOSHIMURA Takanori (Apr. 2015- )