Аннотация:Twenty-three Eunotia Ehrenberg species were found in waterbodies of Vietnam, Laos and Cambodia. Description of twenty-one new species for science are given. These are E. gusevii Glushchenko, Kulikovskiy & Kociolek sp. nov., E. indomalaica Glushchenko, Kulikovskiy & Kociolek sp. nov., E. khursevichiae Glushchenko, Kulikovskiy & Kociolek sp. nov., E. vietnamica Glushchenko, Kulikovskiy & Kociolek sp. nov., E. pseudotetraodon Glushchenko Kulikovskiy & Kociolek sp. nov., E. crassuloides Glushchenko, Kulikovskiy & Kociolek sp. nov., E. korzikovii Glushchenko, Kulikovskiy & Kociolek sp. nov., E. laoarcus Glushchenko, Kulikovskiy & Kociolek sp. nov., E. spiculoides Glushchenko, Kulikovskiy & Kociolek sp. nov., E. bolavenensis Glushchenko, Kulikovskiy & Kociolek sp. nov., E. binthuaniensis Glushchenko, Kulikovskiy & Kociolek sp. nov., E. namlikiensis Glushchenko, Kulikovskiy & Kociolek sp. nov., E. tetraundulata Glushchenko, Kulikovskiy & Kociolek sp. nov., E. vyvermanii Glushchenko, Kulikovskiy & Kociolek sp. nov., E. daklakiensis Glushchenko, Kulikovskiy & Kociolek sp. nov., E. genkalii Glushchenko, Kulikovskiy & Kociolek sp. nov., E. bauchimiensis Glushchenko, Kulikovskiy & Kociolek sp. nov., E. streltsovii Glushchenko, Kulikovskiy & Kociolek sp. nov., E. prowseii Glushchenko, Kulikovskiy & Kociolek sp. nov., E. camranhiensis Glushchenko, Kulikovskiy & Kociolek sp. nov. Some new combinations are suggested. These are E. gibbuolosa (Venkataraman) Glushchenko & Kulikovskiy stat. nov. and E. pantropica Glushchenko, Kulikovskiy & Kociolek nom., comb. et stat. nov. All species are illustrated by original LM micrographs. The distribution of each of the encountered species is discussed.