Onyx Ring, also known as Onyx Bangle, may refer to:
- The armor from Final Fantasy X.
- The Japanese name of an armor from Final Fantasy X.
- The armor from Final Fantasy XI.
- The armor from Dissidia Final Fantasy Opera Omnia.
Onyx is a banded variety of chalcedony. Agate and onyx are both varieties of layered chalcedony that differ only in the form of the bands: agate has curved bands and onyx has parallel bands. The colors of its bands range from white to almost every color (save some shades, such as purple or blue). Commonly, specimens of onyx contain bands of black and/or white.