| Dink O'Brien | |
| Position: | Catcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 13 September 1894 |
| Birth Place: | San Francisco, California |
| Death Place: | Monterey Park, California |
| Debutleague: | MLB |
| Debutdate: | April 26 |
| Debutyear: | 1923 |
| Debutteam: | Philadelphia Phillies |
| Finalleague: | MLB |
| Finaldate: | September 15 |
| Finalyear: | 1923 |
| Finalteam: | Philadelphia Phillies |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .333 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 0 |
| Teams: | |
Frank Aloysius "Dink" O'Brien (September 13, 1894 – November 4, 1971) was a professional baseball player. He was a catcher for one season (1923) with the Philadelphia Phillies. For his career, he compiled a .333 batting average in 21 at-bats.
O'Brien was born in San Francisco, California and later died in Monterey Park, California at the age of 77.