| Summary: | Plants of the genus <i>Scutellaria</i> (Lamiaceae) have a wide variety of bioactive secondary metabolites with diverse biological properties, e.g., anti-inflammatory, antiallergenic, antioxidant, antiviral, and antitumor activities. The chemical composition of the hydroethanolic extracts, obtained from dried plants of <i>S</i>. <i>incarnata</i>, <i>S</i>. <i>coccinea</i>, and <i>S</i>. <i>ventenatii</i> × <i>S</i>. <i>incarnata</i>, was determined by UHPLC/ESI-Q-Orbitrap-MS. The flavones were found in a higher proportion. Baicalin and dihydrobaicalein-glucuronide were the major extract components in <i>S</i>. <i>incarnata</i> (287.127 ± 0.005 mg/g and 140.18 ± 0.07 mg/g), in <i>S</i>. <i>coccinea</i> (158.3 ± 0.34 mg/g and 51.20 ± 0.02 mg/g), and in <i>S</i>. <i>ventenatii</i> × <i>S</i>. <i>incarnata</i> (186.87 ± 0.01 mg/g and 44.89 ± 0.06 mg/g). The <i>S</i>. <i>coccinea</i> extract showed the highest antioxidant activity in the four complementary techniques employed to evaluate all extracts: ORAC (3828 ± 3.0 µmol Trolox<sup>®</sup>/g extract), ABTS<sup>+•</sup> (747 ± 1.8 µmol Trolox<sup>®</sup>/g extract), online HPLC-ABTS<sup>+•</sup> (910 ± 1.3 µmol Trolox<sup>®</sup>/g extract), and β-carotene (74.3 ± 0.8 µmol Trolox<sup>®</sup>/g extract).
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