ONX may refer to:

• Enrique Adolfo Jiménez Airport (IATA: ONX) in Colón, Panama
• Currituck County Regional Airport (FAA: ONX) in Currituck County, North Carolina, United States

• Collonges, Switzerland
• Collonges (Valais)
• Collonges VS
• Collooney railway station
• Collooney Railway Station
• Collooney Station
• Collop
• Collophore
• Collop monday
• Collop Monday
• Collops
• Colloqualism
• Colloque de Poissy
• Colloquia
• Colloquial Australian English place names
• Colloquial Australian English proper names
• Colloquial Australian English proper nouns
• Colloquialisms
• Colloquial term
• Colloquial Welsh morphology
• Colloquio
• Colloquis
• Colloquium
• Colloquium (disambiguation)
• Colloquy