| Birth Date: | 6 September 1974 |
| Birth Place: | Elgoibar, Basque Country, Spain |
| Weight: | 201lbs |
| Occupation: | Wood cutter |
| Ru Position: | Lock, Flanker |
| Amatyears1: | 19??-1993 |
| Amatteam1: | Elorrio Rugby Taldea |
| Years1: | 1993-1997 |
| Years2: | 1997-2004 |
| Years3: | 2004-2006 |
| Years4: | 2006-2009 |
| Years5: | 2009-2011 |
| Years6: | 2009 |
| Years7: | 2011-2015 |
| Years8: | 2015-2018 |
| Years9: | 2018-2019 |
| Clubs1: | Getxo Rugby Taldea[1] |
| Clubs2: | Saint-Jean-de-Luz |
| Clubs3: | Aviron Bayonnais |
| Clubs4: | Ordizia RE[2] |
| Clubs5: | Bera Bera RT |
| Clubs6: | Basque Korsarioak |
| Clubs7: | Gernika RT |
| Clubs8: | Durango RT |
| Clubs9: | Hernani CRE[3] |
| Repyears1: | 1998-2006 |
| Repcaps1: | 20 |
| Reppoints1: | 5 |
| Coachyears1: | 2014-2015 |
| Coachyears2: | 2019 |
| Coachteams1: | Gernika RT[4] |
| Coachteams2: | Spain U-19 |
Oscar Astarloa Uriarte (Basque:Oskar Astarloa, born 6 September 1974 in Elgoibar) is a Spanish former rugby union player and currently coach. He plays as an open-side lock and flanker. He currently coaches Spain national under-19 rugby union team.[5]
His first international cap was during a match against Germany, at Heidelberg, on 26 April 1998. He was part of the 1999 Rugby World Cup roster, playing all the three matches as first choice. His last cap was during a match against Georgia, at Tbilisi, on 28 October 2006. He also took part at the 2001 Rugby World Cup Sevens in Argentina.