The 1951–52 Landsdelsserien was a Norwegian second-tier football league season, the first named Landsdelsserien.
The league was contested by 54 teams, divided into a total of seven groups from four districts; Østland/Søndre, Østland/Nordre, Sørland/Vestland and Møre/Trøndelag. The two group winners in the Østland districts, Larvik Turn and Lillestrøm promoted directly to the 1952–53 Hovedserien. The other five group winners qualified for promotion play-offs to compete for two spots in the following season's top flight. Varegg and Ranheim won the play-offs and were promoted.
Tables District Østland/Søndre
District Østland/Nordre
District Sørland/Vestland Group A1
Group A2
Group B
District Møre/Trøndelag Møre
Trøndelag
Promotion play-offs Sørland/Vestland Results A1–A2 Ålgård 2–0 Flekkefjord Results A–B Varegg 2–2 (a.e.t.) Ålgård Varegg 2–1 Ålgård
Varegg won 2–1 over Ålgård and were promoted to Hovedserien.
Møre/Trøndelag Ranheim 2–0 Hødd
Ranheim won 2–0 over Hødd and were promoted to Hovedserien.
References