Ruben Kristiansen (born 20 February 1988) is a Norwegian professional footballer who plays for Tromsø as a defender.

[2] He started his career at local club Nordreisa, before moving on to play for Skjervøy, Tromsdalen.

[7][8] In October 2024 Brann announced that Kristiansen would not be offered a contract extention after the season was finished.

The following December, his formed club Tromsø confirmed that they had signed Kristiansen on a one-year contract.

[3] He made his international senior debut for Norway against South Africa in a friendly game in January 2013.