Mark Edward Langston (born August 20, 1960) is an American former Major League Baseball left-handed pitcher.

He pitched for the Seattle Mariners (1984–1989), Montreal Expos (1989), California / Anaheim Angels (1990–1997), San Diego Padres (1998), and Cleveland Indians (1999).

After graduating in 1978, he was selected in the 15th round (377th overall) of the 1978 Major League Baseball draft by the Chicago Cubs, who offered him $10,000 to sign with the team.

[1] On December 1, 1989, Langston signed a five-year, $16 million contract with the California Angels as a free agent, making him the highest-paid player in baseball at the time.

[9] Langston was the Angels' starting pitcher for the 1995 American League West tie-breaker game against the Seattle Mariners.

[1] In the 1998 World Series, Langston's 2–2 pitch to Tino Martinez appeared to be over the plate, but was called ball three by home plate umpire Rich Garcia; Langston's next pitch was hit for a grand slam in the seventh inning of Game 1 to give the New York Yankees a 9–5 lead.

Today, he has the fourth-most pickoffs in baseball history, behind only Kenny Rogers, Terry Mulholland and Andy Pettitte, all of them also left-handed pitchers.

[14] On September 20, 2019, after announcing the starting lineups for an away game against the Houston Astros, Langston suffered from ventricular fibrillation and collapsed in the broadcast booth.

[21] Langston appeared as himself in an episode of Sabrina, The Teenage Witch, entitled "To Tell a Mortal", where he plays catch with Harvey.