Mark David Gilbert (born August 22, 1956) is an American former outfielder in Major League Baseball who served as the United States Ambassador to New Zealand and Samoa from 2015 to 2017. Gilbert played for the Chicago White Sox in 1985. Subsequently, he had a career as an investment banker. In 2013, United States President Barack Obama nominated Gilbert to be United States Ambassador to New Zealand and Samoa. The U.S. Senate confirmed Gilbert on December 12, 2014.