Juozas Girnius (May 23, 1915 in Sudeikiai, Utena district – September 13, 1994 in Boston, Massachusetts) was a Lithuanian existentialist philosopher. His philosophy combined existentialism, Catholicism, and Lithuanian nationalism. Together with Antanas Maceina and Stasys Šalkauskis, Girnius became a cornerstone of modern Lithuanian philosophy. In 1994, he was awarded the Order of the Lithuanian Grand Duke Gediminas.