Aleksander Hammer Kjelsen (born 3 January 2006) is a Norwegian professional footballer who plays as defender for the Norwegian club Vålerenga.
Kjelsen spent his youth career at Bærums Verk Hauger.
On his 15th birthday, he signed a three-year contract with the Oslo based club Vålerenga.
[3] He got his first team debut in a cup match on 19 May 2022, being substituted on in the 82nd minute in a 5–1 win against Kolbu/KK.
[4] His league debut was on 16 May 2023, playing the last three minutes in a 3–0 win against HamKam.