Jonathan Robert Papelbon (/ˈpæpəlbɒn/; born November 23, 1980) is an American professional baseball relief pitcher who is currently a free agent. He has played for the Boston Red Sox, with whom he reached four consecutive Major League Baseball All-Star Games from 2006 to 2009, won the 2007 Major League Baseball Delivery Man Award, and was a 2007 World Series champion, as well as the Philadelphia Phillies from 2012 to 2015, and the Washington Nationals from 2015 to 2016. He has worn uniform number 58 throughout his career.

After moving from Baton Rouge, Louisiana, Papelbon attended high school in Jacksonville, Florida, where he played at Bishop Kenny High School and earned All-City accolades prior to attending Mississippi State to play college baseball. Subsequently, in 2003, the Boston Red Sox drafted him in the 4th round of the 2003 Major League Baseball Draft, and he played three seasons of minor league baseball before breaking into the major leagues. His effectiveness as a pitcher used to center on above-average velocity and deceptive breaking balls that fooled hitters.

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