| Sebastian Olszar | |
| Birth Date: | 16 December 1981 |
| Birth Place: | Cieszyn, Poland |
| Height: | 1.82 m |
| Position: | Forward |
| Youthclubs1: | VfB Oldenburg |
| Years1: | 1999–2000 |
| Clubs1: | Beskid Skoczów |
| Years2: | 2000 |
| Years3: | 2001–2002 |
| Clubs3: | Górnik Zabrze |
| Caps3: | 30 |
| Goals3: | 6 |
| Years4: | 2002–2003 |
| Caps4: | 36 |
| Goals4: | 5 |
| Years5: | 2004 |
| Clubs5: | Portsmouth |
| Caps5: | 0 |
| Goals5: | 0 |
| Years6: | 2004 |
| Clubs6: | → Coventry City (loan) |
| Caps6: | 5 |
| Goals6: | 0 |
| Years7: | 2004–2005 |
| Clubs7: | Polonia Warsaw |
| Caps7: | 10 |
| Goals7: | 1 |
| Years8: | 2006 |
| Clubs8: | Górnik Zabrze |
| Caps8: | 3 |
| Goals8: | 0 |
| Years9: | 2006–2007 |
| Clubs9: | Polonia Warsaw |
| Caps9: | 32 |
| Goals9: | 6 |
| Years10: | 2008 |
| Clubs10: | Zagłębie Sosnowiec |
| Caps10: | 8 |
| Goals10: | 0 |
| Years11: | 2008–2010 |
| Clubs11: | Piast Gliwice |
| Caps11: | 44 |
| Goals11: | 9 |
| Years12: | 2010–2012 |
| Clubs12: | Ruch Chorzów |
| Caps12: | 20 |
| Goals12: | 1 |
| Years13: | 2012–2013 |
| Clubs13: | Flota Świnoujście |
| Caps13: | 31 |
| Goals13: | 11 |
| Years14: | 2013 |
| Clubs14: | Bruk-Bet Termalica Nieciecza |
| Caps14: | 1 |
| Goals14: | 0 |
| Years15: | 2014 |
| Clubs15: | Flota Świnoujście |
| Caps15: | 27 |
| Goals15: | 10 |
| Years16: | 2015 |
| Clubs16: | GKS Bełchatów |
| Caps16: | 13 |
| Goals16: | 1 |
| Years17: | 2015–2018 |
| Clubs17: | Greifswalder FC |
| Caps17: | 68 |
| Goals17: | 29 |
| Nationalyears1: | 2001–2003 |
| Nationalcaps1: | 4 |
| Nationalgoals1: | 2 |
Sebastian Olszar (born 16 December 1981) is a Polish former professional footballer who played as a forward.
Olszar signed for Premier League side Portsmouth in January 2004.[1] He made one appearance for the club in an FA Cup tie against Liverpool at Anfield.[2]