Although semen cryopreservation is widely used in cattle breeding, it induces oxidative stress and metabolic alterations that may compromise sperm function. Therefore, antioxidants have attracted interest as a strategy to reduce the adverse effects of sperm cryopreservation, with natural plant extracts representing a sustainable source of bioactive compounds. This study evaluated the effects of two extracts sustainably obtained from white grape marc (ECN and ELN), incorporated into semen extenders as antioxidant additives, on the quality and bioenergetics of cryopreserved bovine sperm. Twelve ejaculates from different bulls were diluted in four extenders, cryopreserved, and evaluated after thawing using computer-assisted sperm analysis, flow cytometry, and Seahorse-based bioenergetic analysis. Neither ECN nor ELN affected sperm viability, acrosome integrity, intracellular reactive oxygen species, glutathione content, intracellular calcium, mitochondrial membrane potential, or total and progressive motility. However, ECN was associated with a slight but significant reduction in the proportion of sperm with coiled tails (p < 0.05), whereas ELN increased glycolytic ATP production compared with the conventional antibiotic treatment (p < 0.05). Overall, both grape marc extracts preserved post-thaw sperm quality and bioenergetic function at levels comparable to those achieved with the conventional antibiotic-containing extender. These findings support the potential of white grape marc extracts as sustainable antioxidant additives for bovine semen extenders and provide a basis for future studies evaluating their antimicrobial efficacy and fertility under field conditions.