Charles J. Shields is an American biographer, primarily of twentieth century American novelists.
In 1997, Shields left a career in high school teaching and administration to write independently. Over the course of the next six years, he published twenty histories and biographies for young people. His first biography for adults, Mockingbird: A Portrait of Harper Lee went on to become a New York Times bestseller.
In 2009, with fellow biographers Nigel Hamilton, James McGrath Morris, and Debby Applegate, Shields co-founded Biographers International Organization (BIO), a nonprofit organization founded to promote the art and craft of biography, and to further the professional interests of its practitioners. As of July 2011, BIO has members in forty-three American states and ten nations, including Australia, India, Kenya, and the Netherlands.