Introduction. Several studies reveal the important role played by‘lesser-known’ wild fruits since they contain nutritional and functional compounds whichhave biological properties. Materials and methods. Our work studied thepresence of bioactive compounds such as vitamin C (ascorbic acid and dehydroascorbicacid), total phenolic content, phenolic acids, flavonols, anthocyanins and the antioxidantcapacity (FRAP, ABTS•+ and DPPH• in vitro tests) in wild fruits ofArbutus unedo L. and Rubus ulmifolius Schott ofSpanish origin, including samples from different seasons and locations. Results anddiscussion. A wide variability was found in the composition of fruits of the samespecies, which substantiates the importance of analyzing several batches of wild fruits,to achieve representative results, taking into account the natural variability.Arbustus unedo fruits showed higher vitamin C, mainly in the ascorbicacid form, and phenolic content than R. ulmifolius [(172–419) mg ascorbicacid×100 g–1 fw vs. (5.99–26.83) mg ascorbic acid×100 g–1 fw, and(773–1621) mg total phenolic compounds×100 g–1 fw vs. (376–1326) mg totalphenolic compounds×100 g–1 fw, respectively]; phenolic acids and anthocyanins are themajor groups of phenolic compounds found in both species, with gallic acid and cyanidin3-glucoside as the main compounds. Arbustus unedo fruits showedsignificantly higher Folin-Ciocalteu values than those of R. ulmifolius.These values are higher than those reported for the majority of berries. The significantcorrelations found among different antioxidant compounds (r > 0.6300,P < 0.001) may reveal a protective effect between ascorbic acid andphenolic acids or anthocyanins in the fruits. Therefore, Arbutus unedoand R. ulmifolius fruits should be considered as new importantsources of safe antioxidants.