| Sean O'Brien | |
| Played For: | Tappara |
| Position: | Left wing |
| Shoots: | Left |
| Height Ft: | 6 |
| Height In: | 1 |
| Weight Lb: | 200 |
| Birth Date: | 9 February 1972 |
| Birth Place: | Boston, Massachusetts, U.S. |
| Draft: | Undrafted |
| Career Start: | 1994 |
| Career End: | 2002 |
Sean O'Brien (born February 9, 1972) is an American former professional ice hockey left winger who played one season in the Finnish SM-liiga for Tappara.