| Frank Eustace | |
| Position: | Shortstop |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | 7 November 1873 |
| Birth Place: | New York, New York |
| Death Place: | Pottsville, Pennsylvania |
| Debutleague: | MLB |
| Debutdate: | April 16 |
| Debutyear: | 1896 |
| Debutteam: | Louisville Colonels |
| Finalleague: | MLB |
| Finaldate: | June 21 |
| Finalyear: | 1896 |
| Finalteam: | Louisville Colonels |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .170 |
| Stat2label: | Home runs |
| Stat2value: | 1 |
| Stat3label: | Runs batted in |
| Stat3value: | 11 |
| Teams: | |
Frank John Eustace (November 7, 1873 – October 16, 1932), was a Major League Baseball catcher for the Louisville Colonels during the 1896 season. His minor league career lasted from 1894 through 1910 and included one year as a player/manager.