Hydroxybenzoic acid may refer to several related chemical compounds:
2-Hydroxybenzoic acid (salicylic acid, o-hydroxybenzoic acid) 3-Hydroxybenzoic acid (m-hydroxybenzoic acid) 4-Hydroxybenzoic acid (p-hydroxybenzoic acid)
See also Dihydroxybenzoic acids Trihydroxybenzoic acids Phenolic acid