Compton Martin is a small village and civil parish within the Chew Valley in Somerset and in the Bath and North East Somerset unitary authority in England. The parish has a population of 508. It lies between Chew Valley Lake and Blagdon Lake, north of the Mendip Hills, approximately 10 miles (16 km) south of Bristol on the A368 road Weston-super-Mare to Bath. A spring rises near the church and feeds the village duck pond, which used to power a paper mill, and ultimately becomes the River Yeo. The Big Green Gathering takes place at Fernhill Farm above the village.