| Jack McAdams | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 17 December 1886 |
| Birth Place: | Bryant, Arkansas |
| Death Place: | San Francisco, California |
| Debutleague: | MLB |
| Debutdate: | July 22 |
| Debutteam: | St. Louis Cardinals |
| Finalleague: | MLB |
| Finaldate: | September 4 |
| Finalteam: | St. Louis Cardinals |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–0 |
| Stat2label: | Earned run average |
| Stat2value: | 3.72 |
| Stat3label: | Strikeouts |
| Stat3value: | 4 |
| Teams: | |
George Decalve "Jack" McAdams (December 17, 1886 – May 21, 1937) was a Major League Baseball pitcher who played in with the St. Louis Cardinals.