Tristan-Samuel Weissborn (born 24 October 1991) is an Austrian professional tennis player who specializes in doubles.

Weissborn made his ATP World Tour doubles debut at the 2016 Swiss Open Gstaad, where he reached with partner Sander Arends the semifinals.

He reached his maiden ATP doubles final at the 2022 Córdoba Open with Andrej Martin.

On his debut at an ATP Masters 1000 tournament, he reached his first semifinal at the 2023 Monte-Carlo Masters with partner Romain Arneodo after upsetting the second-seeded defending champions Rajeev Ram and Joe Salisbury[1] as well as sixth-seeded Lloyd Glasspool and Harri Heliövaara.

[2] They reached their first Masters final defeating German duo Kevin Krawietz and Tim Pütz.