REMA 1000-ligaen is the premier professional men's handball league in Norway. It was established in 1966, and it is currently contested by twelve teams. Sandefjord TIF is the championship's most successful team with nine titles, followed by Oppsal IF with six. Elverum Håndball is the most successful in the Playoffs, with 11 titles. The former sponsor of the league was Grundig, hence the former name "GRUNDIGligaen".