C9H18O
# C9H18O

The molecular formula $C_9H_{18}O$ (molar mass: 142.24 g/mol) may refer to:

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