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Intensive fish farming is responsible for the occurrence of various stressors that negatively affect the health of cultured animals. Polyphenols are plant-derived compounds with biological activities and positive influences on the performances and immunity of fish. The aim of the present study was to evaluate the effects of dietary inclusion of a polyphenol extract obtained from Nero di Troia red grape on the quality of farmed sea bass (<i>Dicentrarchus labrax</i>) fillets. Three diets were tested: control (<i>n</i> = 90) received a conventional feed, whereas the two experimental groups (<i>n</i> = 90 each) received the control feed supplemented with the red grape polyphenol extract (GPE) at the concentration of 100 (GPE 100) or 200 mg/kg (GPE 200). The two GPE diets lowered (<i>p</i> < 0.05) the red (a *) and yellow (b *) indexes, fillet hardness, and total lipid content. Chewiness, concentration of saturated fatty acids, and the Atherogenic Index were higher (<i>p</i> < 0.05) in the control group; GPE diets increased (<i>p</i> < 0.05) the polyunsaturated fatty acids content. Furthermore, the concentration of malondialdehyde was lower (<i>p</i> < 0.05) in fillets of the GPE groups, thus confirming the antioxidant effect of the red grape extract and its effectiveness in preventing lipid oxidation.