Eusebio Guiñazú (born 15 January 1982) is an Argentine rugby union player.

He had a short spell back in Mendoza before he signed for South African Super Rugby franchise the Stormers.

At the end of 2010, he returned to France when he joined Biarritz and shortly after moved to Toulouse.

[2] He signed a contract extension with Munster in January 2015, meaning he will stay with the province until the end of the 2014–2015 season.

He was not initially named to the Argentina squad for the 2007 Rugby World Cup, but was called in for the third-place match against France as a replacement for the injured Mario Ledesma.