The examination of gill parasites from Pangasius micronema Bleeker, 1847 (Siluriformes, Pangasiidae) in Southeast Asia revealed the presence of nine species of Monogenea. Two (Thaparocleidus brevicochleus Pariselle, Lim & Lambert, 2001 and T. sinespinae Pariselle, Lim & Lambert, 2001) have been previously described. Among the others, six species, belonging to Thaparocleidus Jain, 1952 (Monogenea, Ancylodiscoididae) as defined by Lim (1996) and Lim et al. (2001), are considered new species: T. tacitus n. sp., T. summagracilis n. sp., T. portentosus n. sp., T. rukyanii n. sp., T. durandi n. sp., and T. lebrunae n. sp. The remaining species is represented by too few individuals to be conclusively described.