Banzai may refer to:

• A traditional Japanese exclamation meaning "ten thousand years"
• Banzai charge or banzai attack, a last, desperate military charge
• Banzai! (album), a 1991 album by Tigertailz
• Banzai Cliff, one of the sites of mass Japanese suicide on the island of Saipan during World War II
• The Banzai Drop, a variation of the Seated senton professional wrestling move
• Banzai (G.I. Joe), a fictional character in the G.I. Joe universe
• "Banzai" (Kaela Kimura song)
• Banzai! (magazine), the German edition of the Weekly Shonen Jump manga magazine
• Banzai skydive, the act of throwing a parachute out of a plane and trying to catch up to it mid fall, put it on, and deploy it before hitting the ground
• Banzai (film), a 1918 American film
• "Banzai" (B'z song), 2004
• Banzai (TV series), a spoof of Japanese gameshows
• Banzai (The Lion King), a hyena character from the 1994 Disney animated film The Lion King and the Broadway musical of the same name
• Banzai (town), in Pinghe County, Fujian, China
• Banzaï, a 1983 French film
• "Banzai Venus", a 2011 single by SKE48
• Buckaroo Banzai
• Banzai Bill, an enemy from the Mario franchise

Banzaï is a 1983 French comedy film directed by Claude Zidi and starring Coluche.

Banzai!, officially stylized BANZAI!, is a discontinued shonen manga anthology that was published in Germany by Carlsen Verlag, from November 2001 to December 2005. It debuted in November 2001 as a German language adaptation of the popular Japanese manga anthology Weekly Shonen Jump, published by Shueisha. In addition to various series from Weekly Shonen Jump, the magazine serialized some original German manga-influenced comics, including Crewman 3. Issues also included educational articles to teach readers Japanese and columns with news updates on anime and manga series. Series published in the magazine were also published in tankobon volumes under the Banzai! präsentiert and the highly popular series under the Best of Banzai! label. The name Banzai! came from the transliteration of 10,000 years, a traditional Japanese exclamation.