José María Núñez Piossek (born 6 December 1976, in Tucumán) is an Argentine former rugby union footballer.
He represented the Argentina national team, including being a part of their 2003 Rugby World Cup squad.
In 2002, he played in four Tests including games against Uruguay, Paraguay, Chile and Australia.
On 27 April 2003 Núñez Piossek scored 9 tries in a 144–0 victory over Paraguay.
He played a number of Tests during the early part of 2003, and was then included in the Pumas' 2003 Rugby World Cup squad.