Tobias van Dieken (born 1980 in Bonn) is a German actor active in both theater and television.

Tobias van Dieken grew up in North Rhine-Westphalia and completed his acting training from 2000 to 2004 at the renowned Otto Falckenberg School in Munich. This was followed by engagements at various German theaters, including the Schauspielhaus Wuppertal and Theater Bonn. Since 2003, he has been a member of the ensemble at the Münchner Volkstheater.

In addition to his theater work, van Dieken appears regularly in film and television productions. He gained recognition through, among other projects, the RTL comedy series *Arme Millionäre*, in which he played the role of Christoph Münzberger from 2005 to 2006. Further television appearances followed, including in the ARD series *In aller Freundschaft* and, in 2012, in the crime series *Heiter bis tödlich: Fuchs und Gans*, in which he portrayed a police inspector alongside Mira Bartuschek and Peter Bongartz.