Zeta or ZETA can refer to:
Alphabet
- Zeta (letter), the sixth letter of the Greek alphabet
Science
- Zeta functions, in mathematics
- Tropical Storm Zeta (2005), formed in December 2005 and lasted through January 2006
- Z-pinch, in fusion power
- Zero Energy Thermonuclear Assembly reactor, a British test facility
- magnussoft ZETA, a computer operating system
Geography
- Zeta River, in Montenegro
- Zeta plain, in Montenegro
History
- Principality of Zeta, a medieval state, today Montenegro
- Zeta Banovina, one of provinces (banovina) of the Kingdom of Yugoslavia between 1929 and 1941
Popular culture
- Zeta Metroid, species of Metroid from Metroid II: Return of Samus.
- Zeta Phi Beta, African-American Sorority and memebr of the National Pan-Hellenic Council
- Zeta Phi Omega, International Fraternity and Sorority (1975)
- Zeta Phi Omega, (Lambda Upsilon Chapter, LDCU)
- Zeta Tau Alpha, Sorority and member of the National Panhellenic Conference
- Z (film), a political film by Costa Gavras
- Catherine Zeta-Jones, Welsh actress
- GM Zeta platform, a full-size car series
- Mobile Suit Zeta Gundam, a televised anime
- ZETA, a computer operating system
- A reference in the song Exo-Politics by British rock group Muse
Publishing
- Zeta, a Baja California investigative journalism newsweekly
Fictional characters
- Zeta, a fictional robot character appearing in the animated series Batman Beyond and The Zeta Project
- E-105 Zeta, one of the E-Series robots that appeared in Sonic Adventure.
- MSZ-006 Zeta Gundam A fictional mecha that appeared in Zeta Gundam.
- Zeta is the name of one of Zim's classmates on Invader Zim
Other meanings
- Zeta Phi Omega, International Fraternity and Sorority (1975)
- Zeta Phi Omega, (Lambda Upsilon Chapter, LDCU)
- Zeta, an Australian car produced by Lightburn
- ZetaBoards, the new company name for the message board service InvisionFree
- FK Zeta, a Montenegrin football club
- A zeta key, a tool used to drive screws and bolts which have a hexagonal socket in the head. Also known as "hex key".