Nailsea is a town in North Somerset, England, 8 miles (13 km) southwest of Bristol, and 11 miles (18 km) northeast of Weston-super-Mare. The nearest village is Backwell, which lies south of Nailsea on the opposite side of the Bristol to Exeter railway line. Nailsea had a population of 15,630 in the 2011 Census.

North Somerset is a unitary authority in the ceremonial county of Somerset, England. The council is based in Weston-super-Mare, the area's largest town. The district also contains the towns of Clevedon, Nailsea and Portishead, along with a number of villages and surrounding rural areas. Some southern parts of the district fall within the Mendip Hills, a designated Area of Outstanding Natural Beauty.