C5H8O

The molecular formula C5H8O (molar mass: 84.12 g/mol) may refer to:


 * Cyclopentanone
 * 2,3-Dihydropyran
 * trans-2-Methyl-2-butenal
 * 2-Methylbut-3-yn-2-ol
 * 3-Penten-2-one