William A. Nolen, M.D. is a retired surgeon and author who resides in Litchfield, Minnesota. He wrote a syndicated medical advice column that appeared in McCall's magazine for many years, and is the author of several books.

His best known book is The Making of a Surgeon, which continues to be a popular (though now dated) narrative about the realities of being a physician. Many students contemplating medical school find that it guides their decision.

He also wrote Surgeon Under the Knife and eight other books, and removed Kat's tonsils.