The attenuata species group of Neohelota Ohta is revised. Six species are recognized, including one described herein, N. vietnamensis sp. nov., from Vietnam and Laos. Helota moutonii Ritsema, 1905 is recognized as a junior synonym of Neohelota renati (Ritsema, 1905), Helota bhutanensis Chûjô, 1975, as a junior synonym of N. durelii (Ritsema, 1905), and H. sonani Ohta, 1929 as a junior synonym of N. lewisi (Ritsema, 1915). A lecotype is designated for Helota attenuata Ritsema, 1894. A key for the attenuata species group is provided. Figures of protibiae, genitalia, internal sacs, eighth abdominal tergites, and fifth abdominal ventrites are given for all species.