Elizabeth of Bosnia (c. 1339 – January 1387) was queen consort and later regent of Hungary, as well as queen consort of Poland. Her regency was marked by political unrest that led to her death. Daughter of Ban Stephen II of Bosnia, Elizabeth married King Louis I of Hungary in 1353. In 1370, she gave birth to a long-anticipated heir, Catherine, and became queen of Poland when Louis succeeded his uncle, Casimir III. The royal couple had two more daughters, Mary and Hedwig, but Catherine died in 1378. When Louis died in 1382, Mary ascended to the throne of Hungary with Elizabeth as regent. Unable to preserve the personal union of Hungary and Poland, the queen dowager secured the Polish throne for her youngest daughter, Hedwig.