Claas Mertens (born 2 January 1992) is a German lightweight rower.

He won a gold medal at the 2015 World Rowing Championships in Aiguebelette with the lightweight men's eight.

[2] In 2018 Mertens represented Oxford in the Oxford-Cambridge Boat Race.

[4][5] He is an academic researcher in the field of international political economy.

This biographical article relating to German rowing is a stub.