Mark Allan Hendrickson (born June 23, 1974) is an American former baseball and basketball player.

Hendrickson was a three-sport standout in tennis, basketball, and baseball at Mount Vernon High School in the state of Washington.

He was a member of the state championship basketball team during his junior year, where he earned recognition as the co-MVP of the tournament for his play.

He signed as a free agent with the Sacramento Kings on December 23, 1997, appearing in 48 games, averaging 15.4 minutes, 3.4 points and 3.0 rebounds as a reserve player.

Hendrickson made his major league debut for the Blue Jays on August 6, 2002, against the Seattle Mariners as a reliever.

His first victory came in his next start, on September 14 against the Tampa Bay Devil Rays, when he worked six innings, allowed one run and the Jays won 8–4.

Hendrickson is the first pitcher in Toronto Blue Jays history to hit a home run, which he did against the Montreal Expos on June 21, 2003.

[9] On December 14, 2003, he was traded by the Blue Jays along with Sandy Nin to the Colorado Rockies for Justin Speier.

He was traded to the Los Angeles Dodgers on June 27, 2006, along with catcher Toby Hall in exchange for Dioner Navarro, Jae Weong Seo and minor league outfielder Justin Ruggiano.

He immediately joined the Dodgers' starting rotation, but ineffectiveness caused him to be moved to the bullpen for the end of the season, where he was more effective.

On June 9, 2008, Ken Griffey Jr. hit the 600th home run of his career off a fastball thrown by Hendrickson in the 1st inning of a 9–4 loss to the Cincinnati Reds.

On July 7, the Marlins announced that Hendrickson, along with Ryan Tucker, would be moved to the bullpen to make room in the rotation for Josh Johnson and Chris Volstad.

On September 11, 2009, he picked up his only major league save by throwing three shutout innings against the New York Yankees.

On February 10, 2015, Hendrickson signed a minor league contract with an invitation to spring training with the Baltimore Orioles.

[15] Hendrickson is one of 13 athletes that played in both the National Basketball Association and Major League Baseball.

The 13 are: Danny Ainge, Frank Baumholtz, Hank Biasatti, Gene Conley, Chuck Connors, Dave DeBusschere, Dick Groat, Steve Hamilton, Hendrickson, Cotton Nash, Ron Reed, Dick Ricketts and Howie Schultz.