Buch bei Märwil is a village and former municipality in the district of Frauenfeld in the canton of Thurgau, Switzerland.
From 1819 to 1953 it was named Buch bei Affeltrangen.
The municipality also contained the villages Azenwilen and Bohl.
In 1995 the municipality was incorporated into the larger, neighboring municipality Affeltrangen.
This Thurgau location article is a stub.