ONJ

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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