| Alex Mustaikis | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 26 March 1909 |
| Birth Place: | Chelsea, Massachusetts |
| Death Place: | Scranton, Pennsylvania |
| Debutleague: | MLB |
| Debutdate: | July 7 |
| Debutyear: | 1940 |
| Debutteam: | Boston Red Sox |
| Finalleague: | MLB |
| Finaldate: | August 3 |
| Finalyear: | 1940 |
| Finalteam: | Boston Red Sox |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–1 |
| Stat2label: | Earned run average |
| Stat2value: | 9.00 |
| Stat3label: | Strikeouts |
| Stat3value: | 6 |
| Teams: | |
Alexander Dominick Mustaikis (March 26, 1909 – January 17, 1970) was a pitcher in Major League Baseball who played briefly for the Boston Red Sox during the season. Listed at, 180 lb., Mustaikis batted and threw right-handed. He was born in Chelsea, Massachusetts. In one season career, Mustaikis posted a 0–1 record with six strikeouts and a 9.00 ERA in six appearances, including one start, three games finished, and 15.0 innings of work. Mustaikis died at the age of 60 in Scranton, Pennsylvania.