Sundbyberg Municipality (Sundbybergs kommun or Sundbybergs stad) is a municipality in in east central Sweden, just north of the capital . Sundbyberg is wholly within the and has a 100% urban population.

Sundbyberg was detached from Bromma (which since 1916 is in ) in 1888 as a market town (köping). It got the title of a city in 1927. In 1949 parts of Solna Municipality and Spånga (when the rest of Spånga was amalgamated into Stockholm) were added. A proposed merger with Solna in 1971 was never implemented, making Sundbyberg, with an area of 8.83 square kilometres (3.41 sq mi), the smallest municipality in Sweden, but also the most densely populated. The municipality prefers to call itself a city, which, however, has no legal significance.

Sundbyberg was for a long time only an area of small agriculture value and most of all used as a place to spend summer for rich families in the city. In 1863 almost the entire area was bought by Anders Petter Löfström, including Duvbo Estate, who began building houses there. In 1870 the first industrial plot was sold and from there the town did expand with railroad, houses, industries and community services of all kind. A. P. Löfström also donated to the municipality, all land for roads, streets, parks, school, church and other public areas.

Sundbyberg never became a suburb but a totally independent industrial town on its own.

The 44,090 inhabitants live in roughly 17,000 apartments. The industrial policy of the municipality is to provide one job opportunity for every apartment, thus 17,000 jobs. So unlike other municipalities in , Sundbyberg is not a bedroom suburb wherefrom people commute to Stockholm, but also a place commuted to from outside. In total, 12,000 commuters travel to or from Sundbyberg every day.

Sundbyberg is well served by the system. There are several stations as well as one station and plenty of bus routes. Even some main line trains call at Sundbyberg. 1925-1959 Sundbyberg was served by . Light railway returned to Sundbyberg in October 2013 when Tvärbanan light rail service was extended from Sickla Udde via Alvik to Solna centrum. The line runs through Central Sundbyberg with tracks laid in the street and has two stops within the municipality. A northern light railway branch from Ulvsunda to Kista will pass through Rissne. Construction is expected to start in 2017.

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