Onizuka may refer to:
People with the surname Ellison Onizuka (1946–1986), U.S. astronaut who died in the 'Challenger' accident Katsuya Onizuka (born 1970), WBA Super Flyweight champion from Kitakyushu, Japan
Places named after Ellison Onizuka Onizuka Air Force Station, a military station in Sunnyvale, California Onizuka Center for International Astronomy, a visitor information center at Mauna Kea, Hawaii Onizuka Space Center at Kona International Airport, Hawaii Onizuka (crater), a crater on the Moon
Fictional Great Teacher Onizuka, a 1999 live-action, anime and manga series Eikichi Onizuka, the titular character in the series
Other uses Onizuka Station, Karatsu City, Saga Prefecture, Japan