Boston Spa is a village and civil parish in the Leeds Metropolitan District in West Yorkshire, England. Situated 3 miles south of Wetherby, Boston Spa is on the south bank of the River Wharfe across from Thorp Arch. According to the 2001 census, the parish had a population of 4,006 rising to 4,079 in the 2011 census. It sits in the Wetherby ward of Leeds City Council and the Wetherby and Easingwold parliamentary constituency.