Alex Monchak (March 5, 1917 – September 12, 2015) was an American baseball shortstop who played briefly for the Philadelphia Phillies during the 1940 season.

He was primarily known as the first-base coach for all the Major League Baseball (MLB) teams managed by Chuck Tanner from 1971 to 1988, including the 1979 World Series Champion Pittsburgh Pirates.

He served in World War II, achieving the noncommissioned officer (NCO) rank of Staff Sergeant (S-SGT), the campaigns in which he served include Normandy, Northern France, Ardennes, Rhineland, and Central Europe receiving the following citations: American Theater Ribbon, European-African-Middle Eastern Ribbon, Good Conduct Medal, and Victory Medal, according to War Department Adjutant General's Office Form (WD AGO Form) 53-55 dated 1 November 1944 Box 32 Battles and Campaigns, Box 33 Decorations and Citations, and Box 38 Highest Grade Held.

Following his military service, Monchak continued to pursue his childhood dream of a career in baseball by being on the field of play.

Both he and Joe Lonnett were named first- and third-base coaches respectively by manager Chuck Tanner with the Chicago White Sox on October 2, 1970.