Alexander Augustus Lyon (born December 9, 1992) is an American professional ice hockey goaltender for the Detroit Red Wings of the National Hockey League (NHL).
He played collegiately for the Yale Bulldogs men's ice hockey team, competing in the ECAC.
While at Yale University, he was named Ivy League co-Rookie of the Year in 2014. After leading the nation in save percentage, shutouts and goals-against average, Lyon was presented with the Ken Dryden Award (given to the best goalie in the ECAC) his sophomore season, while receiving First-Team AHCA/CCM All-America, First-Team All-ECAC, First-Team All-New England as well as First-Team All-Ivy League honors. He was also the winner of the J. Murray Murdoch Award as Yale's Most Valuable Player.
On May 9, 2018, in a playoff win over the Charlotte Checkers, Lyon saved 94 of 95 shots faced in a record-setting 146 minutes 48 seconds, making it the longest game in AHL history. The game went to fifth overtime with the Phantoms winning 2–1.