C3H4O4

The molecular formula C3H4O4 (molar mass: 104.06 g/mol) may refer to:


 * Glycerol carbonate, a cyclic carbonate ester
 * Hydroxypyruvic acid, a pyruvic acid derivative
 * Malonic acid, a dicarboxylic acid
 * Tartronic acid semialdehyde, the uronic acid of glyceraldehyde
 * Monomethyl oxalate, a compound that cannot be isolated but is an intermediate in synthesizing or hydrolyzing dimethyl oxalate