Osmanabad Assembly constituency is one of the 288 Vidhan Sabha (legislative assembly) constituencies of Maharashtra state in western India.
Osmanabad (constituency number 242) is one of the four Vidhan Sabha constituencies located in Osmanabad district. It covers the entire Kalamb tehsil and part of Osmanabad tehsil of this district. The number of electors in 2009 was 296,247 (male 157,571, female 138,676).
Osmanabad is part of Osmanabad Lok Sabha constituency along with five other Vidhan Sabha constituencies, namely Paranda, Umarga and Tuljapur in Osmanabad district, Barshi in Solapur district and Ausa in Latur district.