Valentin Igor Fédéric Tanner (born 2 October 1992) is a Swiss curler.

He currently plays lead for the Peter de Cruz team from Geneva.

The team played in two World Junior Curling Championships, winning gold at the 2010 World Junior Curling Championships (defeating Scotland's Ally Fraser in the final) and a silver at the 2011 World Junior Curling Championships (losing to Sweden's Oskar Eriksson in the final).

2011 was the final year of junior eligibility for de Cruz.

The next season they played in one Slam, the 2013 Canadian Open of Curling (3-3).