In enzymology, catechol oxidase (dimerizing) () is an enzyme that catalyzes the chemical reaction
The two substrates of this enzyme are catechol and oxygen. Its products are dibenzo(1,4)dioxin-2,3-dione and water.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with oxygen as acceptor. The systematic name of this enzyme class is catechol:oxygen oxidoreductase (dimerizing).