2,6-Naphthalenedicarboxylic acid is an organic compound with the formula C10H6(CO2H)2.

This colorless solid is one of several isomers of naphthalenedicarboxylic acid.

It is a precursor to the high performance polyester polyethylene naphthalate (PEN, poly(ethylene-2,6-naphthalene dicarboxylate)).

It was first prepared by Robert Evert and Victor Merz [de] in 1876 by hydrolysis of 2,6-dicyanonaphthalene.

This article about an aromatic compound is a stub.