Wolfgang Stark (born 20 November 1969 in Landshut), is a German football referee. He has refereed matches in the Champions League and qualifications to the European Football Championship and the World Cup. In 2007, he refereed five matches at the 2007 FIFA U-20 World Cup including the controversial semi-final between Chile and Argentina.
Stark's performance has also been questioned in some Madrid-based newspapers after Real Madrid's 2-0 loss to Barcelona in the 2010–11 UEFA Champions League. The Diario Marca also took issue with a penalty Stark awarded to FC Barcelona in their 3-2 defeat of AC Milan in the next Champions League season's group stage, saying “Aquilani grabbed Xavi inside the box but the contact was not enough to topple Barca brain.” The Italian press was less conclusive, with the Gazetta dello Sport calling the decision “generous”. After the incident he then booked the wrong player, when in fact he should have cautioned Alberto Aquilani who would have been sent off for the offence as it would have been his second booking.
Stark was selected as a referee for the 2008 Summer Olympics football tournament and for the 2010 FIFA World Cup. In the 2010-11 season of the German Bundesliga he was elected worst referee of the first half of the season by the players.