Madron Well and Madron Well Chapel is a scheduled Ancient Monument in the civil parish of Madron, Cornwall, UK. Madron Well Chapel (grid reference SW446328) is the ruin of a 12th- or 14th-century chapel dedicated to St Madern and occupies the site of a much older Celtic structure. Madron Well (grid reference SW445327) is a spring 200 m to the west. Clouties, or offerings, can be seen on the path to the chapel, near the holy well.