Kazper Karlsson

Karlsson grew up in Hisingen and started playing football as a child for BK Häcken, before moving to Halmstads BK at a young age. He made his international debut for Sweden U16 in a double fixture against Denmark U16 in August 2021. He later took part in the 2022 UEFA European Under-17 Championship. He signed a professional contract with Halmstads BK in July 2021, at the age of 16. He scored his first Allsvenskan goal in May 2023. After BK Häcken reportedly placed a transfer bid in late 2023, Karlsson was also linked to Hammarby before instead going abroad to Bologna Primavera. Ahead of the Swedish 2025 season, Karlsson was bought back by AIK for 5 or 6 million kr. However, Karlsson fell into disfavour with manager Mikkjal Thomassen, and was loaned out to Degerfors IF. The loan was extended in 2026, and also included an option to buy. In March 2026, Karlsson made his debut for Sweden U21.

He is a relative of Patrik Karlsson Lagemyr.