Joan Ridder Challinor is the former chairperson of the National Commission on Libraries and Information Science in the United States. She was appointed to the commission by President Bill Clinton in 1995. She served as vice chairperson of the commission from 2000 to 2003. She was designated as its chairperson on July 20, 2003, and served until January 28, 2004. She was succeeded as Chairperson by .