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
See also
OJN JNO Jon (disambiguation) NJO (disambiguation) NOJ (disambiguation)