Norris J. Lacy (born March 8, 1940 in Hopkinsville, Kentucky) is an American scholar focusing on French medieval literature. He was the Edwin Erle Sparks Professor Emeritus of French and Medieval Studies at the Pennsylvania State University until his retirement in 2012, a position he had held since 1998. He is a leading expert on the Arthurian legend and has written and edited numerous books, papers, and articles on the topic. In 2014 the International Arthurian Society, North American Branch, presented him an award for Lifetime Service to Arthurian Studies.