Seventy 2 pigs (36 males and 36 females) with 26.98 ± 4.26 kg of initial weight and 70 d old were used in a 90 d experiment to evaluate the influence of hydrolysable tannin extract supplementation on performance of growing-finishing pig. Animals were weighed, allotted by initial weight, and in groups of 6 (3 males and 3 females) they were placed in 12 paved floor pens (7 × 1.5 m). Pen constituted the experimental unit. In a randomized complete block design, pens were assigned to treatments as follows: 1) Growing and finishing diets formulated with corn and soybean meal (Control); or 2) Control plus addition of 0.2% of hydrolysable tannin extract (HT). The hydrolysable tannin extract was provided as SilvaFeed NutriP (Pronutrient Developer, Mexico). Results were analyzed by ANOVA for a randomized complete block design. During the first 49 d that constituted the growing phase (d 1–49), HT supplementation augmented (P = 0.04) body weight (66.11 vs. 60.18 kg) and improved average daily gain (P = 0.04) by 18% (0.802 vs. 0.680 kg). Addition of HT increased (P < 0.01) average daily feed intake (0.805 vs. 1.675 kg), but the feed intake as proportion of mean body weight was similar between treatments (3.84 vs. 3.89%).The feed efficiency (Gain/feed ratio) was no affected by treatments (0.410 vs. 0.447). During the finishing phase (d 50 to d 90), HT supplementation increased (P = 0.02) feed intake (2.44 vs. 2.08 kg) without effect on ADG and feed efficiency. In complete 90 d experiment (joint growing and finishing phases), HT supplementation tended (P = 0.06) to improve final weight (97.17 vs. 88.17 kg) and average daily gain (0.782 vs. 0.681 kg); increased (P < 0.01) feed intake (2.093 vs. 1.858 kg), without effect on feed efficiency. It is concluded that 0.2% hydrolysable tannin supplementation during the growing phase improves performance of pig, but its addition during the finishing phase does not represent any advantage.