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[edit]

• All pages with titles containing Onj or Onjs
• All pages with titles beginning with ONJ
• All pages with titles beginning with onj
• OJN
• JNO
• Jon (disambiguation)
• NJO (disambiguation)
• NOJ (disambiguation)