Malcolm David "Mack" Hillis (July 23, 1901 – June 16, 1961) was a Major League Baseball second baseman. Hillis played for the New York Yankees in 1924 and the Pittsburgh Pirates in 1928. He had 9 career hits in 37 at bats in 12 games.
Mack Hillis
| Given name: | Malcolm David Hillis |
| Nicknames: | None |
| Primary Pos: | Secondbase |
| Hght/Wght: | 5'10" / 165 lbs |
| Bats/Throws: | R / R |
| Born: | Jul 23, 1901 in Cambridge, MA |
| Died: | Jun 16, 1961 in Cambridge, MA (59 years old) |
| Debut: | Sep 13, 1924 |