Mieczysław Grydzewski (27 December 1894 in Warsaw – 9 January 1970 in London) was a Polish historian and journalist, founder and editor-in-chief of Wiadomości Literackie ('The Literary News') weekly. Wiadomości was continued as a major émigré journal during World War II and until 1981. During his life in Poland and abroad, Grydzewski published numerous books, journal articles, compendiums and other works, often anonymously or under assumed names.