Nynäshamn Municipality

Nynäshamn Municipality
Nynäshamns kommun
Coordinates: 58°54′N 17°57′E / 58.900°N 17.950°E / 58.900; 17.950
CountrySweden
CountyStockholm County
SeatNynäshamn
Area
 • Total
1,300.83 km2 (502.25 sq mi)
 • Land358.76 km2 (138.52 sq mi)
 • Water942.07 km2 (363.74 sq mi)
 Area as of 1 January 2014.
Population
 (30 June 2025)
 • Total
30,605
 • Density85.308/km2 (220.95/sq mi)
Time zoneUTC+1 (CET)
 • Summer (DST)UTC+2 (CEST)
ISO 3166 codeSE
ProvinceSödermanland
Municipal code0192
Websitewww.nynashamn.se
Density is calculated using land area only.

Nynäshamn Municipality (Swedish: Nynäshamns kommun) is a municipality in Stockholm County in east central Sweden. Its seat is located in the city of Nynäshamn.

In 1974 the former City of Nynäshamn (itself instituted in 1946) was merged with Ösmo, from which it had been detached as a market town (köping) in 1911 and Sorunda, all in the Södertörn peninsula and adjacent islands.