The solubilities of isomeric o-, m-and p-coumaric acids in high-pressure carbon dioxide were measured using a now-type experimental apparatus at (308.15, 313.15, and 323.15)K and (8.5, 10, 15, 20, and 25) MPa, respectively. The data were modeled by a density model-based correlation. We found that m-coumaric acid showed the highest solubility and o-coumaric acid showed the lowest solubility at the experimental supercritical conditions.