Juan Severino Somoza (born 16 September 1981) is an Argentine-born Portuguese rugby union footballer. He plays as a lock or as a flanker.
He was a member of Agronomia team, winning the title of National Champion in 2006/2007. He played also for the Italian semi-professional team of Rugby Reggio.
He decided to represent Portugal, and was selected for the 2007 Rugby World Cup finals squad. He played a single game with Scotland. He head-butted a Scottish player, being suspended for four weeks after the incident.
Severino had 50 caps for the "Lobos", from 2006 to 2013, with a try scored, five points in aggregate.