Nacka Municipality (Nacka kommun) is a municipality in in east central Sweden. Its seat is located at Nacka. The municipality is situated just east of the capital and the western parts are considered a suburban part of the city of Stockholm.

The present municipality was created in 1971 when the City of Nacka (itself instituted in 1949) was amalgamated with Saltsjöbaden (itself detached from "old" Nacka in 1909) and Boo.

The municipality is situated in two historical provinces (landskap), Uppland and Södermanland, but in one administrative county (län), .

The western densely built-up area of Nacka Municipality is a contiguous part of the city of . About 50,000 of the municipality's total population live there.

There are also some more localities in the municipality. The larger ones are: Boo, Fisksätra, Saltsjöbaden, Skuru and Älta.

The area has been populated since the first mountaintops emerged as islands from the sea after the end of the last Ice Age, during the Mesolithic. During the Viking Age (800 – 1100 AD) the area has been estimated to have been populated by 100 people. They were living by farming and fishing.

A Danish sailing description from the end of the 13th century describes the area as a transportation region. The water roads were easier to use than the land roads and this was also the main road into the capital Stockholm. Due to these circumstances there were plenty of restaurants along the shores to cater to the travelers. An article by Gunnar Ahlberg describes 24 different outlets and their busy service. In the 18th century the restaurants closer to the city were transformed from shabby small places to more sophisticated establishments. Here came not only travelers but also the citizens of Stockholm for a summer excursion. Many of the artists of the times have documented these excursions in drawings as well as songs.

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