Alexander George McCarthy
- Bats Right, Throws Right
- Height 5' 9", Weight 150 lb.
- School University of Notre Dame
- Debut October 7, 1910
- Final Game July 24, 1917
- Born May 12, 1889 in Chicago, IL USA
- Died March 12, 1978 in Salisbury, MD USA
Alex McCarthy was a middle infielder who came to the Pittsburgh Pirates in 1910 from the University of Notre Dame and spent most of his career with the Pirates. A teammate of Honus Wagner, he was either a double-play partner for Honus or a backup to him for several years.