Mecislovas Reinys (1884 in Madagaskaras, Kovno Governorate – 1953) was a Lithuanian Roman Catholic bishop, a professor at Vytautas Magnus University, a Lithuanian Minister of Foreign Affairs, and a social activist who publicly condemned racism and national hatred.
Mecislovas Reinys was imprisoned by the Soviets after refusing to collaborate with the KGB and sent to Vladimir Prison, where he died in 1953.