Valentin Mattka (1988, Mölln) is a Berlin-based stage designer.

Mattka studied stage and costume design at the Kunsthochschule Berlin Weissensee under Professor Peter Schubert. During his studies, he worked as an assistant stage designer at the Komische Oper Berlin and then at the Schauspielhaus Düsseldorf. There he assisted Rebecca Ringst, Klaus Grünberg and Christof Hetzer, among others. He supervised productions directed by Lydia Steyer, Calixto Bieto, Barrie Kosky  and Stefan Herheim.

Since 2019 he has been working as a freelance stage designer. In close collaboration with director Luise Kautz, he created the stage designs for Die Tote Stadt and La Juive at the Opernhaus Kiel. This was followed by the set for Pierrot Lunaire at the Komische Oper, directed by Barrie Kosky. Most recently, he designed the premiere of the new opera Great Open Eyes at Theater Münster.

Valentin Mattka is an Alumnus of the Akademie Musiktheater heute (Stage design-Scholarship, 2016-18).