Nowe Miasto County () is a unit of territorial administration and local government (powiat) in Warmian-Masurian Voivodeship, northern Poland. It came into being on January 1, 1999, as a result of the Polish local government reforms passed in 1998. Its administrative seat and only town is Nowe Miasto Lubawskie, which lies south-west of the regional capital Olsztyn.
The county covers an area of . As of December 2023 its total population is 41,964, out of which the population of Nowe Miasto Lubawskie is 10,089 and the rural population is 31,875.
Nowe Miasto County is bordered by Ià Âawa County to the north, Dziaà Âdowo County to the east, Brodnica County to the south and Grudziàdz County to the west.
The county is subdivided into five gminas (one urban and four rural). These are listed in the following table, in descending order of population.
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