Helicopsyche annae sp.n., H. barbata sp.n., H. bifida sp.n., H. jacquemarti sp.n., H. pedunculata sp.n., H. stoltzei sp.n., H. tanzanica sp.n., H. ulugurensis sp.n. and H. usambarensis sp.n. (Trichoptera : Helicopsychidae) are described.All the new species inhabit mountainous areas in eastern Tanzania. Helicopsyche marlieri Jacquemart, 1957 fromeastern Zaïre is redescribed. A key to the species known from East Africa is provided. Distributional and ecologicaldata are discussed and briefly analyzed.