Dägerlen is a municipality in the district of Winterthur in the canton of Zürich in Switzerland.
Dägerlen is first mentioned in the 14th Century as Tegerlo. During the 13th Century, Rutschwil (first mentioned in 1219 as Ruoltswilare) was the fief of a Kyburg. It was held by a ministerialis or unfree knight in service of the Counts of Kyburg. They held extensive properties in what would become the municipality of Dägerlen. In 1264, when the Kyburg family died out, it came under the authority of the Habsburgs.
Dägerlen has an area of 8 km2 (3.1 sq mi). Of this area, 66.9% is used for agricultural purposes, 25.2% is forested, 7.4% is settled (buildings or roads) and the remainder (0.5%) is non-productive (rivers, glaciers or mountains).In 1996 housing and buildings made up 4.4% of the total area, while transportation infrastructure made up 2.9%. Water (streams and lakes) made up 0.4% of the total area. As of 2007 4% of the total municipal area was undergoing some type of construction.