C3H4O2

C3H4O2 may refer to:

Compounds sharing the molecular formula:
 * Acrylic acid
 * Malondialdehyde
 * Methylglyoxal
 * 3-Oxetanone
 * Propiolactone isomers:
 * Alpha-Propiolactone (α-propiolactone)
 * Beta-Propiolactone (β-propiolactone)