The predatory capabilities of nymphal and adultOrius insidiosus(Say) preying on larval and adult soybean thrips,Sericothrips variabilis(Beach), were assessed under laboratory conditions. Effects of varying densities of adult soybean thrips on predation by adultO. insidiosuswere also determined.All stages ofO. insidiosustested were able to successfully capture 1st- and 2nd instar larvae and adult soybean thrips. The average number of soybean thrips killed per 24-h period increased with successive nymphal stages ofO. insidiosus, and adult females killed more soybean thrips than did adult males. Adult male and femaleO. insidiosusexhibited a type-II functional response when exposed to varying densities of adultS. variabilis. AdultO. insidiosusappeared to feed past satiation at the high densities of soybean thrips.