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A search for parasitoids of Hemileuca oliviae Cockerell was initiated during summer 1983 in the state of Chihuahua, Mexico. Parasitoids that emerged from egg clusters collected near E1 Sueco were Anastatus semiflavidus Gahan, Microdontomerus sp., and Tetrastichus sp. Mean number of eggs per cluster ± SE was 126.12 ± 37.36, 83.33% of the clusters were parasitized, and 19.71% of all eggs were parasitized. Eggs of pentatomids and possibly mantids are alternate hosts for A. semiflavidus. Tachinid flies Leschenaultia sp. and Chetogena sp. parasitized 54 and 2%, respectively, of the late-instar caterpillars in one site, and the ichneumonid wasp, Enicospilus sp., parasitized 12% of these caterpillars. The chalcids, Brachymeria ovata (Say) and Spilochalcis mariae (Riley), parasitized 4.94 and 2.47% of the pupae, respectively, in one site, but were absent from three other sites. Six of the eight parasitoids (including two possible hyperparasites) found in H. oliviae are new records.