Casey Patrick Kelly (born October 4, 1989) is an American professional baseball pitcher who is a free agent.

He made his Major League Baseball (MLB) debut with San Diego in 2012, but underwent Tommy John surgery the following year.

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.

[3][4] On December 6, 2010, Kelly was traded along with Anthony Rizzo, Reymond Fuentes, and Eric Patterson to the San Diego Padres for three-time All-Star first baseman Adrián González.

[10] The top prospect in the Padres' Minor League system, Kelly opened the 2011 regular season in Double-A with the San Antonio Missions.

He was promoted to the Major Leagues to replace the injured Jason Marquis in San Diego's starting rotation.

Kelly earned a win after pitching six shutout innings in a 3–0 victory over the Atlanta Braves in his Major League debut on August 27, 2012.

In 2015, Kelly was converted into a reliever, appearing in 20 games, 6 starts in AA before being called up to the El Paso Chihuahuas, the Padres AAA minor league affiliate.

[21] Kelly was recalled once again in May to make his first start with the Braves, giving up three runs in five innings in a 5–0 loss to the Philadelphia Phillies.

[23] On January 27, 2017, Kelly signed a minor league contract with the Chicago Cubs and was invited to spring training.

In 7 starts down the stretch for the Triple–A Sacramento River Cats, he posted a 2–3 record and 4.17 ERA with 39 strikeouts in 41.0 innings of work.

Kelly was called up to relieve and start for the major league team in mid-August, due to other pitchers' injuries.

[27] On November 20, 2018, Kelly signed to a one-year, $1 million deal with the LG Twins of the KBO League for the 2019 season.

[33] In 2023, he made 30 starts for the club, posting a 10–7 record and 3.83 ERA with 129 strikeouts across 178+2⁄3 innings of work, being the winning pitcher for the 2023 Korean Series.

[37] After two starts for the Triple–A Louisville Bats, the Reds selected Kelly's contract and added him to their active roster on August 24.