Hugo Nys (French pronunciation: [yɡo nis]; born 16 February 1991) is a Monégasque professional tennis player who previously represented France until 2019. A doubles specialist, he reached his highest ATP doubles ranking of No. 12 on 12 June 2023 and singles ranking of No. 327 on 29 July 2019. He became the first ever Monegasque player to reach the semifinal and final of a Major at the 2023 Australian Open.

His grandfather was Francis Nys, a French tennis player.

At the 2019 Los Cabos Open, Nys won his maiden doubles title with partner Romain Arneodo.

Nys won his second doubles title at the Estoril Open, with partner Tim Pütz.

Later in May, Nys won his next doubles title at the Lyon Open, again with Pütz. As a result, he reached a career-high of No. 53 in doubles on 24 May 2021.

The Nys/Pütz duo reached the quarterfinals of the 2021 French Open, where they were defeated by eventual runner-ups Kazakh duo Bublik/Golubev.

At the US Open, he reached the quarterfinals of a Grand Slam for the second time in his career with partner Jan Zieliński, defeating 10th seeded pair Jamie Murray/Bruno Soares and Ariel Behar/Gonzalo Escobar. The pair won their first title at the 2022 Moselle Open.

With Zieliński, Nys reached his first Grand Slam final at the Australian Open, defeating second seeds Rajeev Ram and Joe Salisbury on the way. He became the first Monegasque player to reach a Grand Slam final. They were defeated by wildcard Australian pair of Jason Kubler and Rinky Hijikata in the championship match. He reached the top 20 on 13 February 2023.