| Ray O'Brien | |
| Position: | Outfielder |
| Bats: | Left |
| Throws: | Left |
| Birth Date: | 31 October 1894 |
| Birth Place: | St. Louis, Missouri |
| Death Place: | Richmond Heights, Missouri |
| Debutleague: | MLB |
| Debutdate: | June 27 |
| Debutyear: | 1916 |
| Debutteam: | Pittsburgh Pirates |
| Finalleague: | MLB |
| Finaldate: | July 12 |
| Finalyear: | 1916 |
| Finalteam: | Pittsburgh Pirates |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .211 |
| Stat2label: | Home runs |
| Stat2value: | 0 |
| Stat3label: | Runs batted in |
| Stat3value: | 3 |
| Teams: | |
Raymond Joseph O'Brien (October 31, 1894 – March 31, 1942)[1] was a professional baseball player. He played a total of 16 games as an outfielder for the 1916 Pittsburgh Pirates. From 1913 to 1932, O'Brien also played for various minor league teams.