For his success in cross-country skiing, Karlsson was awarded the Holmenkollen medal in 1952 (shared with Stein Eriksen, Torbjørn Falkanger and Heikki Hasu).
Nils Lofgren | Bert Karlsson | Stefan Karlsson | The Wonderful Adventures of Nils | Nils Petter Molvær | Nils Malmros | Nils Johan Berlin | Nils Asther | The Nils | Sofia Karlsson | Nils Widforss | Nils Trædal | Nils Ole Oftebro | Nils-Olav Johansen | Nils Norén | Nils Hylander | Nils Ericson | Nils Christoffer Dunér | Karlsson-on-the-Roof | The Wonderful Adventures of Nils (anime) | Sofia Karlsson (singer) | Nils V. "Swede" Nelson Award | Nils Voss | Nils von Rosenstein | Nils Torvalds | Nils Svärd | Nils Svantesson Sture | Nils Sture | Nils Skutle | Nils Pfingsten-Reddig |
For his Nordic combined and cross country skiing successes, Hasu became the first Finn to be awarded the Holmenkollen medal in 1952 (shared with Stein Eriksen, Torbjørn Falkanger, and Nils Karlsson.).