Austin Thomas Slater is an American professional baseball outfielder who is a free agent. He has previously played in Major League Baseball (MLB) for the San Francisco Giants, Cincinnati Reds, Baltimore Orioles, Chicago White Sox, New York Yankees, Miami Marlins, New York Mets, and Tampa Bay Rays. He played college baseball for the Stanford Cardinal, and was selected by the Giants in the eighth round of the 2014 MLB draft. He made his MLB debut in 2017 with the Giants.