During the species composition study of terrestrial cyanobacteria and algae from volcanic soils of Shiveluch Volcano (Kamchatka peninsula, Russia) eighteen taxa from five phyla were revealed: Cyanobacteria – 4, Bacillariophyta – 4, Ochrophyta – 2 (Eustigmatophyceae – 1, Xanthophyceae – 1), Charophyta – 1, Chlorophyta – 7 (Chlorophyceae – 2, Trebouxiophyceae – 5). Nitzschia communis Rabenhorst, Nitzschia palea (Kützing) W. Smith, Eolimna minima (Grunow) Lange-Bertalot, Eremochloris sp., Tetradesmus obliquus (Turpin) M.J. Wynne, Nostoc edaphicum Kondratyeva were most frequency.