Horgen is a municipality in the district of Horgen in the canton of Zürich in Switzerland.

It is one of the larger towns along the south bank of the Lake of Zurich.

On 1 January 2018 the former municipality of Hirzel merged into the municipality of Horgen.

Horgen is also the type-site of Switzerland's middle Neolithic archaeological culture. The settlement there, the so-called Horgner Kultur (Horgen culture), produced examples of a type of crude pottery with parallels to the Seine-Oise-Marne culture of northern France. Horgen is first mentioned in 952 as Horga.

Horgen has an area of 21.1 km (8.1 sq mi). Of this area, 27.7% is used for agricultural purposes, while 49.9% is forested. Of the rest of the land, 20.4% is settled (buildings or roads) and the remainder (2%) is non-productive (rivers, glaciers or mountains). In 1996 housing and buildings made up 12.5% of the total area, while transportation infrastructure made up the rest (7.9%). Of the total unproductive area, water (streams and lakes) made up 1.6% of the area. As of 2007, 16% of the total municipal area was undergoing some type of construction.

The large municipality stretches from the shores of Lake Zurich (elevation 408 m (1,339 ft)), near Wädenswil over the Zimmerberg-Plateau where the decentralized village of Horgenberg is found (elevation 660 m (2,170 ft)), though the Sihl Valley (Sihltal), to the peak of the Albis chain (elevation 915 m (3,002 ft)). It includes the villages of Horgen, Arn and Horgenberg.

Until 1773, Horgen included the now separate municipalities of Oberrieden and Hirzel. The Sihl forest (Sihlwald) became part of the city of Zürich in 1803. However the Horgen city council refused to acknowledge this until 1877.

Horgen has a population (as of 31 December 2020) of 23,090. As of 2007, 27.1% of the population was made up of foreign nationals. As of 2008 the gender distribution of the population was 49% male and 51% female. Over the last 10 years the population has grown at a rate of 10.7%. Most of the population (as of 2000) speaks German (79.9%), with Italian being second most common ( 5.7%) and Albanian being third ( 2.8%).

In the 2007 election the most popular party was the SVP which received 35.6% of the vote. The next three most popular parties were the SPS (18.9%), the FDP (15.8%) and the CSP (9.7%).

The age distribution of the population (as of 2000) is children and teenagers (0–19 years old) make up 20.7% of the population, while adults (20–64 years old) make up 64.1% and seniors (over 64 years old) make up 15.2%. In Horgen about 73% of the population (between age 25–64) have completed either non-mandatory upper secondary education or additional higher education (either university or a Fachhochschule). There are 7850 households in Horgen.

Horgen has an unemployment rate of 2.66%. As of 2005, there were 213 people employed in the primary economic sector and about 39 businesses involved in this sector. 2017 people are employed in the secondary sector and there are 167 businesses in this sector. 6892 people are employed in the tertiary sector, with 623 businesses in this sector. As of 2007 56.5% of the working population were employed full-time, and 43.5% were employed part-time.

As of 2008 there were 5924 Catholics and 6170 Protestants in Horgen. In the 2000 census, religion was broken down into several smaller categories. From the census, 39.3% were some type of Protestant, with 36.9% belonging to the Swiss Reformed Church and 2.4% belonging to other Protestant churches. 33.6% of the population were Catholic. Of the rest of the population, 7% were Muslim, 9.5% belonged to another religion (not listed), 4.2% did not give a religion, and 11.7% were atheist or agnostic.

The historical population is given in the following table:

year	population
1467	67 households
1634	1,175
1654	1,560
1780	2,837
1836	2,886
1850	4,844
1900	6,883
1930	9,320
1950	10,118
1970	15,691
2000	17,432
2010	18,935
2020	23,073

The A3 motorway passes through the municipality and has a junction in the south of the town.

The municipality of Horgen is served by three railway stations. Of these two are relatively close to each other in the lakeside part of the municipality, while the other is some distance away from the centre of the town in the Sihl Valley:

• Horgen is on the Lake Zurich left bank line and is served by Zurich S-Bahn lines S2 and S8. The station is in the town centre and adjacent to the lake.
• Horgen Oberdorf is on the Thalwil–Arth-Goldau line, and is served by the S24. Horgen Oberdorf station is some 0.9 kilometres (0.56 mi) uphill from Horgen station.
• Sihlwald is on the Sihltalbahn and is the terminus of the S4. Sihlwald station is in the Sihl Valley, about 4 kilometres (2.5 mi) north of the closed Sihlbrugg station. The Sihtalbahn continues to Sihlbrugg station, but this stretch of line no longer carries regular passenger service.

The Zimmerberg bus line (Zimmerbergbus), provided by the Sihltal Zürich Uetliberg Bahn (SZU), connects the Zimmerberg region and parts of the Sihl Valley.

In the summer there are regular boats to Zürich-Bürkliplatz as well as along the lake to Rapperswil, run by the Zürichsee-Schifffahrtsgesellschaft. The Horgen–Meilen car ferry connects Horgen and Meilen across the width of Lake Zurich, and one of the line's ships carries the name Horgen.

• Adele Duttweiler (1892–1990), wife of Gottlieb Duttweiler and philanthropist
• Ernst Sieber (1927–2018), pastor, social worker, writer and former politician who founded Sozialwerke Pfarrer Sieber
• Hoyte van Hoytema (born 1971), cinematographer
• Jacob Wipf, politician
• Steve Lee (1963–2010), musician, former singer of Gotthard
• Andy Schmid, Professional Handballer

• Official website (in German)
• Horgen in German, French and Italian in the online Historical Dictionary of Switzerland.
• Horgen Culture in German, French and Italian in the online Historical Dictionary of Switzerland.
• Horgen (Vogtei) in German, French and Italian in the online Historical Dictionary of Switzerland.