Clofibric acid is a biologically active metabolite of the lipid-lowering drugs clofibrate, etofibrate and with the molecular formula C<sub>10</sub>H<sub>11</sub>ClO<sub>3</sub>. It has been found in the environment following use of these drugs, for example in Swiss lakes and the North Sea.
Some derivatives of clofibric acid are in a drug class called fibrates.