Cathinka "Tinka" Cecilie Friis Tandberg (Norwegian: [kɑˈtɪŋkɑ sɛˈsiːlɪə ˈfɾiːs ˈtɑnˌbærɡ]; born 18 June 2004) is a Norwegian professional footballer who plays as a forward for Women's Super League club Tottenham Hotspur and the Norway national team.

She started her youth career at age 5 in IL Heming, and played with various boys' teams. When starting to play on the girls' team, it was the team for players born in 2001. In 2018, she moved to Stabæk, but did not yet make it to the first team. She moved to Lyn in 2020 and was given a place in the senior team, while attending Wang sport school from age 16.

Ahead of the 2023 season, she moved abroad to Damallsvenskan, the Swedish title challengers Linköpings FC. She performed well throughout the season. In November 2023, she scored 6 goals in a match against IFK Kalmar.

In August 2024, she signed with Swedish club Hammarby IF a contract during the summer transfer window until 2027.

On 4 September 2025, Tandberg signed with Tottenham Hotspur in the English Super League. In the first away game of the 2025–26 season, Tandberg assisted the first goal and scored the second goal in a 2–0 victory against Everton. Her goal was widely considered spectacular and was shot from 40 yards out.

Following the withdrawals of several players, Tandberg was called up for Norway for the 2023-24 UEFA Nations League matches against France.