Thirty-two new species in the plant bug genus Orthotylus are described from the Hawaiian IsIands. The new species and their host plant associations are as follows: O. metrosideropsis n. sp., from Oahu, on Metrosideros polymorpha; O. ohia n. sp., from Oahu, on Metrosideros polymorpha; O. olapa n. sp., from Oahu, on Cheirodendron trigynum; O. perrotteticola n. sp., from Molokai, on Perrottetia sandwicensis; O. perrottetiopsis n. sp., from Oahu, on Perrottetia sandwicensis; O. dubautiae n. sp., from Kauai, on Dubautia raillardiodes; O. dubauticola n. sp., from Kauai, on Dubautia microcephala; O. pisoniacola n. sp., from Kauai, on Pisonia sandwicensis; O. elaeocarpi n. sp., from Kauai, on Eleocarpus bifidus; O. clermontiopsis n. sp., from Kauai, on Clermontia fauriei; O. pipturicola n. sp., from Kauai, on Pipturus albidus; O. pipturiphila n. sp., from Molokai, on Pipturus albidus; O. antidesmoides n. sp., from Molokai, on Antidesma platyphyllum; O. diospyrivorus n. sp., from Lanai, on Diospyros sandwicensis; O. coprosmaphagus n. sp., from Kauai, on Coprosma waimeae and Coprosma kauaiensis; O. coprosmivorus n. sp., from Lanai, on Coprosma ochracea; O. manonophila n. sp., from Kauai, on Hedyotis terminalis; O. manonovorus n. sp., from Lanai, on Hedyotis terminalis; O. manono n. sp., from Molokai, on Hedyotis terminalis; O. manonocola n. sp., from Molokai, on Hedyotis terminalis; O. manonophagus n. sp., from Molokai, on Hedyotis acuminata; O. manonoides n. sp., from Oahu, on Hedyotis terminalis; O. manoniella n. sp., from Oahu, on Hedyotis centranthoides; O. neopsychotriopsis n. sp., from Lanai, on Psychotria mariniana; O. neopsychotricus n. sp., from Maui, on Psychotria mariniana; O. kopikocola n. sp., from Kauai, on Psychotria hexandra; O. kopikovorus n. sp., from Kauai, on Psychotria mauiensis; O. kopikopsis n. sp., from Lanai, on Psychotria mariniana; O. kopikoides n. sp., from