Button Snap is a 17th-century cottage in northeast Hertfordshire. It is on a rural gravel road west of the village of Westmill. It has been listed since 1967 as a Grade II building in the British Listed Buildings scheme. This cottage has a unique history. It was originally owned by Francis Field, the uncle of the writer Charles Lamb. In 1812 Field's widow conveyed this property to Lamb, who lived in the cottage until 1815, when he sold it. Lamb mentioned this house in an essay, "My First Play." Lamb even apparently gave the cottage its name of Button Snap.