Tartronic acid or 2-hydroxymalonic acid is an organic compound with the structural formula of HOHC(CO<sub>2</sub>H)<sub>2</sub>. This dicarboxylic acid is related to malonic acid. It is a white solid. It is produced by oxidation of glycerol:
Glyceric acid is an intermediate.
Its derivative, 2-methyltartronic acid, is isomalic acid.
Oxidation of tartronic acid gives the ketone mesoxalic acid, the simplest oxodicarboxylic acid.