Seuzach is a municipality in the district of Winterthur in the canton of Zürich in Switzerland.

44.6% is used for agricultural purposes, while 24.3% is forested, 30.1% is settled (buildings or roads), and the remainder (0.9%) is non-productive (rivers, glaciers or mountains).

As of 2007[update], 22.1% of the total municipal area was undergoing some type of construction.

Most of the population (as of 2000[update]) speaks German (92.5%), with Italian being second most common ( 2.1%) and Albanian being third ( 1.0%).

In the 2007 election, the most popular party was the SVP which received 41.8% of the vote.