Other
- Ipomoea aquatica or Ong choi, a semi-aquatic tropical plant grown as a leaf vegetable
- Battle of Ong Thanh, Vietnam (1967)
- ONG Jeans, a domestic Korean clothing manufacturer and jeans label
- Ong's Hat, a collaborative work of fiction
- Orthodontic National Group, the specialist group representing orthodontic nurses and therapists in the United Kingdom and Republic of Ireland
- Oklahoma Natural Gas, a component of ONEOK, Inc.
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