American Freedom and Catholic Power is an anti-Catholic book by American writer Paul Blanshard, published in 1949 by Beacon Press. Blanshard asserted that America had a "Catholic problem" in that the Church was an "undemocratic system of alien control". The book has been described as bigoted and "vicious", propaganda and as "the most unusual bestseller of 1949-1950". It was based on a series of articles that he had published in the magazine The Nation.