Zoophiles for the Ethical Treatment of Animals

Zeta is the name of one of Zim's classmates on Invader Zim

Mobile Suit Zeta Gundam, a televised anime

Riemann zeta function

A Grey, a type of alien being (from space)

Catherine Zeta-Jones, Welsh actress

zeta is also the Spanish name of letter z.

Zeta (letter), the sixth letter of the Greek alphabet

Z-pinch, in fusion power

Z (film), a political film by Costa Gavras

Zeta functions, in mathematics

Tropical Storm Zeta (2005), formed in December 2005 and lasted through January 2006

FK Zeta, a Montenegrin football club

GM Zeta platform, a full-size car series

Zeta, an Australian car produced by Lightburn

zetta-, a prefix in the SI system of units

Zeta Chi Zeta, Local Fraternity based in Oswego, NY. Est. 1969

Zeta plain, in Montenegro

Zeta River, in Montenegro

magnussoft ZETA, a computer operating system

Principality of Zeta, a medieval state, today Montenegro

Zeta Banovina, one of provinces (banovina) of the Kingdom of Yugoslavia between 1929 and 1941

Zeta, a Baja California investigative journalism newsweekly

A zeta key, a tool used to drive screws and bolts which have a hexagonal socket in the head. Also known as "hex key".

Zeta Phi Beta, African-American Sorority and member of the National Pan-Hellenic Council

Zeta Tau Alpha, Sorority and member of the National Panhellenic Conference

ZetaBoards, the new company name for the message board service InvisionFree

Los Zetas, a criminal organization based in Mexico

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.