Swainswick is a small village and civil parish, 3 miles (4.8 km) northeast of Bath, on the A46 in the Bath and North East Somerset unitary authority, Somerset, England. The parish has a population of 265. The village name was also spelled Sweyneswik and Sweyneswick in the early 13th to 14th Century.

The A46 is a major A road in England. It starts east of Bath, Somerset and ends in Cleethorpes, Lincolnshire, but it does not form a continuous route. Large portions of the old road have been lost, bypassed, or replaced by motorway development. Between Leicester and Lincoln the road follows the course of the Roman Fosse Way, but between Bath and Leicester, two cities also linked by the Fosse Way, it follows a more westerly course.