Book excerpt: This issue contains the first of a planned set of three publications greatly expanding knowledge of the platygastroid genus Oxyscelio Kieffer. We recognize 90 species in the Indo-Malayan and Palearctic realms, 71 of which are described here as new species. We divided these species into 13 species groups in order to highlight unique or unusual morphological features shared by certain species. A total of 438 specimen photographs are provided to aid in specimen identification. Newly discovered species are described from Brunei, China, Christmas Island, India, Indonesia, Japan, Laos, Malaysia, Nepal, The Philippines, Singapore, South Korea, Sri Lanka, Taiwan, Thailand, and Vietnam.