The giant earthworms from Vietnam are being reviewed to consist of six species, Amynthas dangi (Thai, 1984), A. munglonganus (Thai & Tran, 1986) comb. nov., A. ghilarovi (Thai, 1982), and three new, A. munglongoides sp. nov., A. antoanensis sp. nov. and A. konkakinh sp. nov. All six species have lengths ranging 300-680 mm, diameter ca. 16-20 mm, and without copulatory pouches. The new species, A. munglongoides sp. nov. is characterised by three pairs of spermathecal pores in intersegment 5/6/7/8, genital markings paired in vii, viii and xviii. A. antoanensis sp. nov. is distinguished by four pairs of spermathecal pores in 5/6/7/8/9, genital marking paired in viii, ix, and xviii. A. konkakinh sp. nov. is recognised by four pairs of spermathecal pores in 5/6/7/8/9, genital marking single in viii, paired in xviii. In addition, a key to all six gigantic species in Vietnam is also provided.