The titular fictitious planet in the novel Halo: Ghosts of Onyx

Onyx (group), a Queens-based rap group

Onyx (interception system), a Swiss intelligence gathering system

Onyx Environnement, the waste management division of Veolia Environnement

Kyle McNeely, pro wrestler known by the ring name Oynx

Onyx Grand Prix, a short-lived Formula One team, 1989-1990

Onyx (satellite), a code name often associated with newer variants of the Lacrosse satellite, a series of reconnaissance satellite owned by the United States National Reconnaissance Office

Onyx, California, a census-designated place located in Kern County, California

Onyx (planet), a fictitious planet in the Power Rangers Universe

HMS Onyx (S21), an Oberon-class submarine of the British Royal Navy

Onyx (comics), a fictional comic book character in the DC Universe, mainly associated with the Batman titles

USS Onyx (PYc-5) a United States Navy patrol vessel of the mid-20th century

Onyx River, a meltwater stream in the Antarctic

Onyx Sports Cars

Onyx Cave, a common name for caves in the United States

Onyx programming language, a BSD-licensed embeddable stack-based programming language

Onyx is a banded variety of chalcedony (quartz). Onyx can also be used to mean the color black, especially "jet" black. Onyx may also refer to: Locations:

Onyx Von Trollenberg, a character from the animated series Trollz.

Onyx Primal, a Predacon Assassin from the Transformers Beast Wars cartoon series. This figure was available in exclusively at Botcon 1996.

SGI Onyx, a line of symmetric multiprocessing computers from Silicon Graphics that are frequently used for high-end graphics, modelling, and simulation work

Synaptics Onyx, a concept cellphone designed to display Synaptics ClearPad technology.

Onyx-15, an adenovirus being researched for cancer treatment

Onix, a fictional character in the Pokémon series.