The South-Eastern Norway Regional Health Authority (Norwegian: Helse Sør-Øst RHF) is the largest of the four Regional health authorities in Norway. It covers the counties of Viken, Oslo, Innlandet, Vestfold og Telemark, and Agder, with 57% of the total population in Norway. The authority owns ten health trusts that operate the hospitals as well as the Hospital pharmacy enterprise that operates seventeen pharmacies and Sykehuspartner Trust that operates the information technology systems.