Mieczysław Grydzewski (December 27, 1894 in Warsaw – January 9, 1970 in London) was a Polish historian, journalist, founder and editor-in-chief of the Wiadomości Literackie weekly.
In 1939, Grydzewski emigrated through Romania and Italy first to France, and after France's capitulation, to the UK where he stayed for the rest of his life. In 1946, he resumed the publication under the title of Wiadomości, known for its intransigent stance towards the Communist takeover of Poland.