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The Himalayan wild berries Myrica esculenta, Duchesnea indica, Prunus cerasoides, and Berberis lycium were studied for the first time for polyphenolic compositions using high‐performance liquid chromatography/electrospray ionization tandem mass spectrometry. The chemical analysis of extracts resulted in the identification of 69 polyphenols, including 11 anthocyanins, 28 phenolic acids, 19 flavanoids, 10 ellagitannins, and 1 dihydrochalcone. The caffeoylquinic acids, quercetin, kaempferol, and cyanidin are the common moieties in studied wild berries. In addition, seven phenolic compounds, that is, gallic acid, vanillic acid, caffeic acid, rutin, ferulic acid, quercetin, and myricetin were quantified. Among anthocyanins, cyanidin‐3‐O‐glucoside was the majorly quantified anthocyanin that ranged from 2.52 to 6.18% followed by delphinidin‐3‐O‐glucoside (0.6%–5.53%). The samples were assessed for total phenolics, total anthocyanin content, and antioxidant potential. The results showed that M. esculenta and B. lycium had the highest total phenolic and anthocyanin content and exhibited promising antioxidant activity with IC50 of 32.100 ± 0.42 and 48.44 ± 0.46 μg/mL, respectively. Principal component analysis was able to clearly differentiate between four underutilized Himalayan wild edible berries. The wide variability of polyphenolic constituents supports the consumption of these berries not only to achieve the nutrient requirements among local people but also as promising sources of antioxidants for the food industry.