Matthew Wallner (born December 12, 1997) is an American professional baseball outfielder for the Minnesota Twins of Major League Baseball (MLB).
Born and raised in Forest Lake, Minnesota, Wallner played three years of college baseball at the University of Southern Mississippi. He finished his collegiate career as Southern Mississippi's all-time home run leader before the Minnesota Twins selected him with the 39th overall selection of the 2019 MLB draft. He played in their minor league system for four years before making his MLB debut in 2022.