succinic acid, a dicarboxylic acid of molecular formula C₄H₆O₄ that is widely distributed in almost all plant and animal tissues and that plays a significant role in intermediary metabolism. It is a colourlesscrystalline solid, soluble in water, with amelting point of 185–187° C (365–369° F).

Succinic acid was first obtained as a distillation product ofamber (Latin:succinum), for which it is named. The common method of synthesis of succinic acid is the catalytichydrogenation ofmaleic acid or its anhydride, although other methods are being used and investigated. Succinic acid has uses in certain drugcompounds, in agricultural and food production, and in manufacturing.