Hedmark [ˈheːdˈmɑrk] (listen) is a county in Norway, bordering Sør-Trøndelag to the north, Oppland to the west and Akershus to the south. The county administration is in Hamar.

Hedmark makes up the northeastern part of Østlandet, the southeastern part of the country. It has a long border with Sweden, Dalarna County and Värmland County. The largest lakes are Femunden and Mjøsa, the largest lake in Norway. Parts of Glomma, Norway's longest river, flow through Hedmark. Geographically, Hedmark is traditionally divided into: Hedemarken, east of Mjøsa, Østerdalen, north of Elverum, and Glåmdalen, south of Elverum. Hedmark and Oppland are the only Norwegian counties with no coastline. Hedmark also hosted some events of the 1994 Winter Olympic Games.

Hamar, Kongsvinger, Elverum and Tynset are cities in the county. Hedmark is one of the less urbanized areas in Norway; about half of the inhabitants live on rural land. The population is mainly concentrated in the rich agricultural district adjoining Mjøsa to the southeast. The county's extensive forests supply much of Norway's timber; at one time, logs were floated down Glomma to the coast but are now transported by truck and train.

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