| Olivier Claessens | |
| Birth Date: | 1988 12, df=yes |
| Birth Place: | Edegem, Belgium |
| Height: | 1.84 m |
| Currentclub: | KFC Baal |
| Position: | Forward |
| Youthyears1: | 1994–2000 |
| Youthyears2: | 2000–2004 |
| Youthyears3: | 2004–2007 |
| Youthyears4: | 2007–2008 |
| Youthclubs1: | Kontich FC |
| Youthclubs2: | TSV Lyra |
| Youthclubs3: | Antwerp |
| Youthclubs4: | Willem II |
| Years1: | 2008–2009 |
| Years2: | 2009–2010 |
| Years3: | 2010–2011 |
| Years4: | 2011–2012 |
| Years5: | 2012–2013 |
| Years6: | 2013–2015 |
| Years7: | 2015–2016 |
| Years8: | 2016–2017 |
| Years9: | 2017–2018 |
| Years10: | 2018–2020 |
| Years11: | 2020– |
| Clubs1: | RC Mechelen |
| Clubs2: | Cercle Brugge |
| Clubs3: | FCV Dender EH |
| Clubs4: | Sint-Niklaas |
| Clubs5: | KSC Grimbergen |
| Clubs6: | K. Berchem Sport |
| Clubs7: | KAC Betekom |
| Clubs8: | KFC Herent |
| Clubs9: | KFC Kontich |
| Clubs10: | KFC Herent |
| Clubs11: | KFC Baal |
| Caps1: | 30 |
| Caps2: | 15 |
| Caps3: | 32 |
| Caps4: | 17 |
| Caps5: | 23 |
| Caps6: | 59 |
| Caps7: | 5 |
| Goals1: | 9 |
| Goals2: | 0 |
| Goals3: | 8 |
| Goals4: | 2 |
| Goals5: | 6 |
| Goals6: | 7 |
| Goals7: | 3 |
| Pcupdate: | 15 October 2015 (UTC) |
Olivier Claessens (born 22 December 1988 in Edegem) is a Belgian former professional football player (currently playing as amateur). His position on the field is forward and he is currently under contract with Belgian side KFC Baal from the Belgian Provincial Leagues.
Claessens was part of the starting eleven in RC Mechelen's cup successes against Germinal Beerschot and Zulte Waregem. Against Germinal Beerschot, Claessens missed an open goal from a tight angle. In the confrontation with Zulte Waregem, he saw a valid goal disallowed.