Kaja Horst Haugseng (born 23 September 2001) is a Norwegian handball player who plays for Sola HK in REMA 1000-ligaen and the Norwegian national team.
She made her debut on the Norwegian national team on 21 April 2022, against North Macedonia.
Her father Rune Haugseng was also a professional handball player, and so is her brother Andreas Horst Haugseng.