Märstetten is a municipality in the district of Weinfelden in the canton of Thurgau in Switzerland.

Scattered finds from the Neolithic era, Roman ruins and a series of grave from the Early Middle Ages show that there was a continuous settlement in the area.

In the High Middle Ages the Baron of Märstetten had a castle located above the church.

The modern municipality of Märstetten is first mentioned in 1155 as Marsteten when the Cathedral of Constance granted it as a fief to the Freiherr von Klingen.

The appellate court for Märstetten was the Lord of Altenklingen, then after, 1460 the Governor of Thurgau and later the federal Tagsatzung.

In 1613, the Cathedral canon, Salomon Buchhorner, had a new manor house (German: Kehlhof) which administered the villages of Boltshausen, Illhart, Sonterswil, Märstetten, and Ottoberg.

In 1482 Pope Sixtus IV issued a papal bull which granted the village the right to hire a lay priest.

[3] Starting in 1860, the citizens and residents gathered on St. Hilary's day (13 January) for the municipal, local and school community meeting, as well as the so-called Hilärimahl meal.

[3] Märstetten has an area, as of 2009[update], of 9.97 square kilometers (3.85 sq mi).

Of the rest of the land, 1.18 km2 (0.46 sq mi) or 11.8% is settled (buildings or roads), 0.05 km2 (12 acres) or 0.5% is either rivers or lakes.

[4] The municipality is located in the Weinfelden district, on the western foot of the Ottenberg.

It consists of the haufendorf village (an irregular, unplanned and quite closely packed village, built around a central square) of Märstetten and the hamlets of Boltshausen, Altenburg, Dattenhub and Ruberbaum as well as the former Ortsgemeinde of Ottoberg.

[6] The age distribution, as of 2009[update], in Märstetten is; 269 children or 11.0% of the population are between 0 and 9 years old and 385 teenagers or 15.7% are between 10 and 19.

[13] The historical population is given in the following table:[3][14] The Hohes Haus and the Church of St. Jakob are listed as Swiss heritage sites of national significance.

The villages of Märstetten and Ottoberg, the hamlet of Boltshausen and the Ottenberg Südhang area are all listed as part of the Inventory of Swiss Heritage Sites.

[15] The Hohes Haus is a half-timbered building which was built in 1613 by Salomon Buchhorner, from the Cathedral of Constance, as a tithe barn.

[7] From the 2000 census[update], 573 or 25.6% were Roman Catholic, while 1,247 or 55.8% belonged to the Swiss Reformed Church.

Of the children in kindergarten, 17 or 40.5% were female, 9 or 21.4% were not Swiss citizens and 4 or 9.5% did not speak German natively.

At the lower primary level, there were 29 children or 49.2% of the total population who were female, 8 or 13.6% were not Swiss citizens and 8 or 13.6% did not speak German natively.

In the upper primary level, 38 or 42.7% students were female, 10 or 11.2% were not Swiss citizens and 5 or 5.6% did not speak German natively.

[21] Märstetten railway station is a stop of the Zürich S-Bahn on services S24 and S30.