Regensdorf () is a municipality in the Dielsdorf District of the canton of Zürich, Switzerland. It is the largest city in the Furttal region.
Katzensee is a lake that also includes Strandbad Katzensee, a lido on the border with the Affoltern quarter of the city of Zürich.
Regensdorf is first mentioned in 870 as Reganesdorf. In 931, it was mentioned as Wat and in 1040 as Adalinchova, probably when Alt-Regensberg Castle was built by the House of Regensberg.
Regensdorf has an area of . Of this area, 43.5% is used for agricultural purposes, while 23.6% is forested. Of the rest of the land, 30.6% is settled (buildings or roads) and the remainder (2.3%) is non-productive (rivers, glaciers or mountains).
The municipality is located on both sides of the Furtbach (Furt stream). It consists of the villages of Watt (which in turn includes the hamlets of Oberdorf, Altburg, Katzensee and Neu-Hard), Adlikon and Regensdorf (which includes the hamlets of Alt-Hard and Geissberg).
Regensdorf sits in a plain, at an elevation of . The shallow eastâÂÂwest Furt valley in which it sits is surrounded by several hills. To the north is Regensberg (), on which stands Regensberg Castle. To the northwest, beyond Buchs, is Lägern (). To the south is Gubrist (), through which passes the A1 motorway via the Gubrist Tunnel. To the southwest is Altberg (), on the summit of which stands Waldschenke Altberg.
Regensdorf has a population (as of ) of . , 31.4% of the population was made up of foreign nationals. Over the last ten years the population has grown at a rate of 16.5%. Most of the population () speaks German (77.8%), with Italian being second most commbon (5.6%) and Albanian being third (3.9%).
In the 2007 election the most popular party was the SVP which received 48.2% of the vote. The next three most popular parties were the SPS (16.5%), the FDP (9.5%) and the CVP (8.7%).
The age distribution of the population () is children and teenagers (0âÂÂ19 years old) make up 21.7% of the population, while adults (20âÂÂ64 years old) make up 67.7% and seniors (over 64 years old) make up 10.6%. In Regensdorf about 65.6% of the population (between age 25âÂÂ64) have completed either non-mandatory upper secondary education or additional higher education (either university or a Fachhochschule).
Regensdorf has an unemployment rate of 3.39%. , there were 97 people employed in the primary economic sector and about 30 businesses involved in this sector. 2,418 people are employed in the secondary sector and there are 163 businesses in this sector. 6,321 people are employed in the tertiary sector, with 626 businesses in this sector.
The historical population is given in the following table:
The Regensdorf-Watt railway station is a stop of the Zürich S-Bahn and is served half-hourly by the serviceâÂÂconnecting Regensdorf to Baden AG as well as Zürich HB and Uetikon am See. Furthermore connects Regensdorf with Zürich HB during weekday peak hours, while SN6 runs from Winterthur to Würenlos via Zürich HB and Regensdorf on Friday and Saturday nights.
Regensdorf is served by bus lines 451 (Regensdorf Zentrum to Adlikon), 452 (Regensdorf Zentrum to Regensdorf Moosächer), 453 (Regensdorf Watt to Adlikon), 454 (Regensdorf Allmend to Regensdorf Watt), 456 (Dielsdorf to Regensdorf Watt), 485 (Zürich Altstetten to Buchs) and 491 (Hüttikon to Zürich Zehntenhausplatz).
FC Regensdorf, an amateur football club formed in 1937, play at the Sportanlage Wisacher on Wiesackerstrasse. As of the 2025âÂÂ26 season, they are in the first section of 2. Liga, the sixth tier of football in Switzerland.