The defending champion in the singles, Robin Söderling , could not compete due to injury. In this year's final, Roger Federer prevailed against Juan Martín del Potro in two sets . This was his second title win in Rotterdam after 2005 and the 71st ATP title of his career. Jürgen Melzer and Philipp Petzschner were the defending champions in doubles . However, Petzschner entered this year with a new partner and was eliminated in the quarter-finals. In the final, Michaël Llodra and Nenad Zimonjić won in three sets over Robert Lindstedt and Horia Tecău , fending off five match points. This was their fifth joint ATP title. Llodra had previously won 22 titles with various partners, Zimonjić even 43, including in 2009 and 2010 in Rotterdam.
The field of participants in the individual competition consisted of 32 players, that of the doubles competition consisted of 16 pairs.
The qualification took place from February 11 to 12, 2012. Four qualifying places were played, which entitle them to participate in the main draw of the tournament.