Grandidierella gravipes Barnard, 1935 was first collected in 1925 from Songkhla Lagoon and was previously identified as G. magnae Giles, 1890. After ten years, the specimens were reidentified as a new species and named G. gravipes. The amphipod was reported once in India but has not been reported in Thai Waters since the first sampling in 1925. In this study, the G. gravipes was found living together with G. gilesi Chilton, 1921. The amphipods were collected by Ekman grab and seven types of settlement plates during March–August 2022. The number of both species were highest in March, however, G. gilesi had higher density than G. gravipes. Both species can be found highest in the fine filter. We provide a redescription of newly collected material with the illustration and the key to species of the genus Grandidierella in Thailand.