Spilsby is a market town and civil parish in the East Lindsey district of Lincolnshire, England. The town is adjacent to the main A16, 33 miles east of Lincoln, 17 miles north-east of Boston and 13 miles north-west of Skegness. It lies at the southern edge of the Lincolnshire Wolds and north of the Fenlands. The town has been a rural market town for more than 700 years. It has changed little in size since the beginning of the 19th century.