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9O or 9-O may refer to:
- 9O, IATA code for National Airways Cameroon
- 9°, an abbreviation for ninth in some languages
- Grêmio Atlético do 9° Regimento; see Grêmio Atlético Farroupilha
- 9O–9T, the ITU prefix codes for Democratic Republic of the Congo
- 9O, squadron code for No. 44 Maintenance Unit; see List of RAF Squadron Codes
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