Gallic acid is an important carboxylic acid used in pharmaceutical industries owing to its medicinal properties. The separation of gallic acid from fermentation broth and dilute aqueous streams is a challenging task. Therefore, in the present study the reactive extraction of gallic acid from an aqueous solution by using tributyl phosphate in octanol, ethyl acetate, n-hexane, and toluene as diluents, respectively, has been carried out at constant temperature (303 +/- 1 K). The results were compared with those of the extraction using pure diluents in order to compute the intensification of extraction obtained. Experiments were performed to investigate the effect of initial acid concentration, extractant concentration, and diluent type. TBP + hexane was found to be most suitable solvent system resulting in the highest distribution coefficient (K-D = 24) when TBP was employed at a concentration of 1.516 molkg(-1). The equilibrium complexation constant (K-E) was observed to be in the ranges of 3.18-8.8 for n-hexane, 0.91-4.54 for toluene, 2.295-4.546 for ethyl acetate, and 3.57-6.17 for octanol.