1,4-Dihydroxynaphthalene is an organic compound with the formula . It is one of several isomers of dihydroxynaphthalene. The compound attracted some interest because in its molten state, it exists mainly as the diketo tautomer.
It can be prepared by reduction of 1,4-naphthoquinone with dithionite as well as by acid-hydrolysis of 1-hydroxy-4-aminonaphthalene. Both routes are reversible: oxidation of the diol give the naphthoquinone and addition of ammonia gives back the hydroxyaminonaphthalene.