ONJ
# ONJ

ONJ may refer to:

* Olivia Newton-John (1948–2022), an English-born Australian singer and actress
* osteonecrosis of the jaw, a severe bone disease that affects the maxilla and the mandible
* Odate-Noshiro Airport (IATA airport code: ONJ), in Akita Prefecture, Japan
* Onjob language (ISO 639 language code: onj)
* Orchestre National de Jazz, a French jazz ensemble
