In demography we study growth of population, its distribution and characteristics, its religious and linguistic composition, sex ratio, age composition migration, standard of living, its economic structure etc. we also study adaption of various human groups to their respective environments in different parts of the world. Various aspects of population have been studied since long. The aim of present paper is study of sex ratio in Osmanabad district of Maharashtra. The present research paper is based on secondary sources of data. The secondary data obtained from District census handbook, District Gazetteers, District statistical department, Socio-economic review and district statistical abstract etc. Collected data is processed and presented in the forms of tabular and graphical methods. According to revised figures of 2011 census, the total population of Osmanabad district was 1660311. Out of total population 864674 are males and 795637 are females. Thus, the sex ratio for Osmanabad district population is 920 (Census 2011).