The Lithuanian Women's Union (Lithuanian: Lietuvos moterų sąjunga or LMS) was a women's organization active in Lithuania from 1922 to 1933. The First Congress of Lithuanian Women held in 1907 called for the establishment of the union, but it was not accomplished due to conflicts between Catholic clergy and socialists. The union was officially established in 1922 and initially chaired by Felicija Bortkevičienė. The union was supported by the Social Democratic Party of Lithuania and the Peasant Union, opponents of the authoritarian President Antanas Smetona who came to power in 1926. Therefore, it was in opposition to the government-sponsored Lithuanian Women's Council. The union was officially closed on 10 June 1935.