Born in Xustás, Cospeito, Spain on October 13, 1971. He began in the field of short films and then became known for his appearance in the TV series "Galicia Riptide" that launched him to fame in Galicia. In February of 2003 he was elected 'Galego of the Month' by El Correo Gallego. He is currently an honorary ambassador of the Casco Vello Vigo.

He received the Goya Award of the Academy of Motion Picture Arts and Sciences of Spain in 2003 as Best Actor for Mondays in the Sun and in 2004 for Best Actor for Take My Eyes. He also won the Silver Shell for the Film Festival San Sebastian in 2003 for Take My Eyes. In the 2009 edition he won the Award for Best Actor for his performance in Cell 211. In 2010 , Cell 211 , Lope and also the rain , movies in which it operates, were chosen by the Academy to represent Spain at the Oscars , and was finally rain also the one selected.

Lui Tosar was one of the visible faces of the support of world culture to the Platform Never Again during the crisis caused by the wreck of the tanker Prestige (November 2002 ), which subsequently distanced politicized directly to consider what he did live " unpleasant moments when politics came together with all that. The social movements are fine, but when it comes politics go awry. As it happened, for example, with the platform "Nunca Mais".

His career has won various awards outside the film industry among which include the Xarmenta Award in 2005 for his advocacy of the Galician language in El Bierzo . It has also been involved in politics, show their support by BNG and Galician nationalism , having participated in the party lists in the 2005 European elections and the municipal by Rey Castro , 2 as well as participating in the platform Never Again . In the European Parliament elections of 2004 participated in the coalition lists Galeusca on behalf of BNG.

Currently involved in the filming of the English film Mr. Nice with Rhys Ifans , Chloë Sevigny , David Thewlis and Spanish Elsa Pataky in studies of the City of Light in Alicante.