Eighteen Chinese species of Ooencyrtus were studied. Ooencyrtus uniformis is described as new to science. Ooencyrtus flavipes (Timberlake), O. lucina Huang and Noyes, O. nezarae Ishii, and O. telenomicida (Vassiliev) are first recorded from China. Ooencyrtus malacosomae Liao is synonymized with O. kuvanae (Howard). A key to the species is given, and photomicrographs are provided to illustrate the morphological characters of the species. Type specimens are deposited in the Institute of Zoology, Chinese Academy of Sciences, Beijing.