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 1940 season.
Listed at 6 ft 3 in (1.91 m), 180 lb., Mustaikis batted and threw right-handed.
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.
This biographical article relating to an American baseball pitcher born in the 1900s is a stub.