Märwil is a village and former municipality in the district of Frauenfeld in the canton of Thurgau, Switzerland.

It was first recorded in 827 as Marinwilare.

The municipality also contained the villages Breite, Ghürst, Himmenreich and Langnau.

In 1995 the municipality was incorporated into the larger, neighboring municipality Affeltrangen.

This Thurgau location article is a stub.