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This study aimed to evaluate a complete nutritional composition in the seeds  Quercus virginiana  to compare this nutritional composition with three Mediterranean  Quercus  species. We analyzed the seed morphometry, proximate composition, phytochemicals, and antioxidant capacity. The seed of  Q. virginiana  presented the smaller seed size and weight, while  Q. suber  presented the highest values. Moreover,  Q. virginiana  seeds showed the highest amounts of sugar and total lipids, digestibility, energy, palmitic acid, and stearic acid. On the other hand,  Q. virginiana  seeds showed the lowest values of linoleic acid. Moreover,  Q. coccifera  seeds presented the highest total phenolics and flavonoids contents and antioxidant activity. The clustering analysis revealed a significant similarity in seed morphometry and nutritional composition between the Mediterranean  Q. ilex  and  Q. suber , grouping with the American  Q. virginiana , but to a considerable distance; by contrast, the Mediterranean  Q. coccifera  was the most distant in the clustering analysis. The content of phenolics and flavonoids and digestibility value were the variables that contributed to the separation to a greater extent in the clustering of the four species. The nutritional and biological activity assessment of plant seed may be considered as an essential mission to find new sustainable sources and novel chemical agents. In this sense,  Quercus  seeds may be an alternative and a competitive food source for the agri-food industry.

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Interspecific Variation between the American Quercus virginiana and Mediterranean Quercus Species in Terms of Seed Nutritional Composition, Phytochemical Content, and Antioxidant Activity