Norris J. Lacy (born 1940) is an American  scholar focusing on French medieval literature. He is the Edwin Erle Sparks Professor Emeritus of French and Medieval Studies at the Pennsylvania State University. 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.