John Rider Klauder (born January 24, 1932) is an American professor of physics and mathematics, and author of over 250 published articles on physics. He graduated from University of California, Berkeley in 1953 with a Bachelor of Science. He received his PhD in 1959 from Princeton University where he was a student of John Archibald Wheeler. He was inducted as a Foreign Member of the Royal Norwegian Society of Sciences and Letters, and received the Onsager Medal in 2006 at NTNU (Norway).