The solubility of 2,3-dihydroxybenzoic acid in 12 organic solvents (ethanol, n-propyl alcohol, isopropyl alcohol, n-butanol, isoamyl alcohol, ethyl formate, methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, acetonitrile, and acetone) was measured by gravimetric method at the temperatures from 278.15 to 318.15 K under atmospheric pressure. The solubility of 2,3-dihydroxybenzoic acid in these 12 monosolvents increases with temperature and presents the following order at a fixed temperature: acetone > ethanol > isopropyl alcohol > n-propyl alcohol > n-butanol > isoamyl alcohol > methyl acetate > ethyl acetate > n-propyl acetate (isopropyl acetate) > ethyl formate > acetonitrile. The van't Hoff equation, Ah equation, and modified Apelblat equation were used to mathematically correlate the experimental solubility data, and the correlative results were all good.