Casey Patrick Kelly (born October 4, 1989) is an American professional baseball pitcher in the Chicago Cubs organization. He was a first-round draft choice, 30th overall, in the 2008 Major League Baseball Draft by the Boston Red Sox. He was the top minor league prospect in the Red Sox organization when he was acquired by the San Diego Padres after the 2010 season, along with three other prospects, in exchange for All-Star player Adrian Gonzalez. He made his major league debut with San Diego in 2012, but underwent Tommy John surgery the following year. He was traded to Atlanta after the 2015 season.

Kelly was drafted in the first round, 30th overall, in the 2008 Major League Baseball Draft by the Boston Red Sox. He was drafted as a pitcher, though he wanted to play shortstop. Kelly was also offered a scholarship to play football for the University of Tennessee, as he was a two-time regional player of the year as a quarterback at Sarasota High School. Kelly chose baseball over football and signed with the Red Sox for a $3 million signing bonus, $700,000 more than the sixth player in the draft received.

Kelly played the first half of the 2009 season with the Greenville Drive and Salem Red Sox as a pitcher. He was elected to the All-Star Futures Game. He finished the second half of season as a shortstop. On December 8, 2009, Kelly announced his decision to continue his career as a full-time pitcher. He had hit .222 while striking out 27 percent of the time, while he had a 6–1 record with a 1.12 ERA pitching with Class A Greenville.

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