Dan O'Brien Jr. | |
|---|---|
| Born | 1953 or 1954 (age 70–71)[1] |
| Alma mater | Rollins College Ohio University |
| Occupation | Baseball executive |
| Known for | 16th general manager of the Cincinnati Reds |
| Father | Dan O'Brien Sr. |
Daniel F. O'Brien Jr. (born 1953 or 1954) is an American baseball executive who served as general manager of the Cincinnati Reds of Major League Baseball (MLB) from October 2003 to January 2006.