Chemistry:C9H18O

The molecular formula C₉H₁₈O may refer to:

• Nonanal
• Nonanones
  • 2-Nonanone
  • 3-Nonanone
  • 4-Nonanone
  • 5-Nonanone, or dibutyl ketone
• 3,3,5-Trimethylcyclohexanol