The Mycobacteria 7H11 agar medium has ben compared with the Löwenstein-Jensen medium for the growth of Mycobacterium tuberculosis. Fifty five strains of M. tuberculosis isolated from different clinical specimens in Sivas have been used in this study. Thirty two of them grew on the Mycobacteria 7H11 agar within ten days but only 26 grew on the Löwenstein-Jensen medium.