Asselby is a village and civil parish in the East Riding of Yorkshire, England. It is located in the south-west of the county, north of the River Ouse. It is situated approximately 2 miles (3.2 km) west of the market town of Howden.
The civil parish is formed by the village of Asselby and the hamlet of Knedlington, together with that part of Boothferry village west of the B1228 road. According to the 2011 UK census, Asselby parish had a population of 351, a rise from the 2001 UK census figure of 299. The parish covers an area of 532.14 hectares (1,314.9 acres).
In 1974 most of what had been the East Riding of Yorkshire was joined with the northern part of Lincolnshire to became a new English county named Humberside. The urban and rural districts of the former counties were abolished and Humberside was divided into non-metropolitan districts. The new organization did not meet with the pleasure of the local citizenry and Humberside was wound up in 1996. The area north of the River Humber was separated into two "unitary authorities"—Kingston-upon-Hull covering the former City of Hull and its closest environs, and the less urban section which, once again, named itself the East Riding of Yorkshire.