2-hydroxy-4-methoxybenzoic acid is a methoxybenzoic acid that is benzoic acid substituted by hydroxy and methoxy groups at positions 2 and 4, respectively. It has a role as a plant metabolite. It is a methoxybenzoic acid and a monohydroxybenzoic acid. It is a conjugate acid of a 2-hydroxy-4-methoxybenzoate. 4-Methoxysalicylic acid is a natural product from Periploca sepium.