Kristoffer Tønnessen

Kristoffer Tønnessen (born 1 October 1997) is a Norwegian football defender who plays for Start.

He made his league debut for Jerv in the 2013 3. divisjon, and took part in successive promotions to the 2016 1. divisjon. At the end of the season, Jerv was only minutes away from yet another promotion, but ultimately lost the decisive playoff match.

In the summer of 2019, Tønnessen signed a four-year contract with Start. His first game for the club came against Sogndal in a 1–0 win. Before leaving the club Tønnessen made one hundred appearances for the club across all competitions.

Ahead of the 2023 season he went to Lillestrøm on a three-year contract. Only months after the move, Tønnessen featured in the 2022–23 Norwegian Football Cup final, where Lillestrøm lost to Brann.

After the 2025 season, Start announced that Tønnessen had signed with them from the 2026 season. The move saw Tønnessen return to his former club three years after leaving at the end of 2022.