Troms og Finnmark (Norwegian: [trʊms ɔ ˈfɪ̀nːmɑrk]; Northern Sami: Romsa ja Finnmárku [ˈromːsa ja ˈfinːmaːrku]; Kven: Tromssa ja Finmarkku; Finnish: Tromssa ja Finnmark) was a county in northern Norway that existed from 2020 to 2023. The county was established on 1 January 2020 as the result of a regional reform. It was the largest county by area in Norway, encompassing about 75,000 square kilometres (29,000 sq mi), and was formed by the merger of the former Finnmark and Troms counties in addition to Tjeldsund Municipality from Nordland county.
The administrative centre of the county was split between two towns. The political and administrative offices were based in the city of Tromsø (the seat of the old Troms county). The county governor was based in the town of Vadsø (the seat of the old Finnmark county). The two towns are about 800 kilometres (500 mi) apart, approximately a 10-hour drive by car.
On 15 June 2022, the parliament decided to split the county back into Finnmark and Troms beginning on 1 January 2024, with Tjeldsund Municipality assigned to Troms county (Tjeldsund had been part of Nordland county before 2020).
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