| Mack Hillis | |
| Position: | Second baseman |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | July 23, 1901 |
| Birth Place: | Cambridge, Massachusetts |
| Death Place: | Cambridge, Massachusetts |
| Debutleague: | MLB |
| Debutdate: | September 13 |
| Debutyear: | 1924 |
| Debutteam: | New York Yankees |
| Finalleague: | MLB |
| Finaldate: | September 27 |
| Finalyear: | 1928 |
| Finalteam: | Pittsburgh Pirates |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .243 |
| Stat2label: | Home runs |
| Stat2value: | 1 |
| Stat3label: | Runs batted in |
| Stat3value: | 7 |
| Teams: | |
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 and the Pittsburgh Pirates in . He had 9 career hits in 37 at bats in 12 games.