Michał Jan Rostworowski (August 27, 1864, Dresden – March 24, 1940, Tarnów) was a Polish-Austrian lawyer. He was professor of international and constitutional law at the University of Cracow from 1903 to 1930, serving as rector in the 1925–1926 academic year. He was elected as a judge of the Permanent Court of International Justice, which position he held until his death in 1940.