Robert Scott Jenks (born March 14, 1981) is an American professional baseball coach and former pitcher who is currently the manager for the Windy City ThunderBolts of the Frontier League.

Jenks is a two-time All-Star who formerly held the major league record for retiring consecutive batters (41).

[4][5] He was sent to the club's Double-A affiliate, the Birmingham Barons to begin the 2005 season, posting a 1–2 with 19 saves and a 2.85 ERA in 35 appearances.

[8] Jenks and Adam Wainwright of the 2006 St. Louis Cardinals are the only rookie closers to earn a save in the clinching game of a World Series.

In 2006, Jenks was selected to the American League All-Star team, and finished the season 3–4 with a 4.00 ERA while converting 41 out of 45 save opportunities in 67 relief appearances.

[10] On September 25, 2007, Jenks was named as one of 10 finalist for the "DHL Presents the Major League Baseball Delivery Man of the Year Award".

On August 20, 2007, Jenks allowed a base hit by Kansas City Royals outfielder Joey Gathright, ending his streak of 41 consecutive batters retired.

His teammate Mark Buehrle broke the record for most consecutive batters retired on July 28, 2009, ending with 45 in a row.

A June game against the Yankees saw him get hurt when trying to throw a four-seam fastball that saw him describe the pain as "almost like a spoon had been shoved into my back."

On September 13, 2011, the Red Sox announced that Jenks had been diagnosed with a pulmonary embolism; he soon came down with colitis as well.

Dr. Kirkham Wood, head of the orthopedic bone unit at Massachusetts General Hospital (MGH) did not finish the second level of decompressing.

Beginning in May 2021, Jenks served as the pitching coach for the Grand Junction Rockies of the MLB Partner Pioneer League.

After spending the 2023 campaign as the pitching coach with the Princeton WhistlePigs, he was named manager of the Windy City ThunderBolts on October 26 of that year.

Jenks wrote about his experiences with addiction in 2019 for The Players' Tribune, where he once mixed Percocet and Ambien when alone at his apartment in Fort Myers, Florida for spring training that saw him lay out his food from his refrigerator onto the floor before stabbing his television with a knife.

Additionally, Jenks spent time in Portugal during the baseball offseasons, to be nearer to his second wife's family.