Arttu Mikael Olavi Lötjönen is a Finnish centre-back born on 28 January 2004. He plays for KuPS in the Veikkausliiga and has represented Finland at under-21 level. Listed by UEFA as a KuPS defender, he has been part of the club's European registration while developing in senior Finnish football. His profile is that of a young central defender moving from domestic development into first-team and European squad environments with KuPS.