Denis Hollenstein (born 15 October 1989) is a Swiss professional ice hockey winger who currently plays for the ZSC Lions in the National League (NL).

[1] On 8 December 2015, Hollenstein signed a three-year contract extension worth SFr 2.1 million to continue playing for Kloten.

[2] Meanwhile, rumors circulated that Hollenstein's contract with the ZSC had been increased to SFr 1 million per season.

It was officially confirmed on 27 November 2017 that Hollenstein had agreed to a five-year contract worth SFr 5 million with the Lions.

Hollenstein competed in the 2012 IIHF World Championship as a member of the Switzerland men's national ice hockey team.