Mats Julian Hummels (born 16 December 1988) is a German footballer who plays as a central defender for the German Bundesliga club Borussia Dortmund and the German national football team.

He came through the Bayern Munich youth academy before joining his current club on loan in January 2008, and he officially signed for Dortmund in February 2009 for €4 million. His honours at the club include two league titles and finishing as runner up in the 2012-13 UEFA Champions League.

Hummels has been a full international since 2010, earning over 30 caps and representing Germany at the UEFA Euro 2012 and the 2014 FIFA World Cup.