Spilsby is a market town and civil parish in the East Lindsey district of Lincolnshire, England. The town is situated adjacent to the main A16 Trunk Road, east from the county town of Lincoln, north-east from Boston and north-west from 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. The town centre includes a range of small supermarkets, banks, traditional newsagents, baker, butchers, jewellers and clothing stores, together with public houses, cafes and ethnic fast-food takeaways.
At the centre of town is an open square or traditional market place, from which the four main town streets radiate. Markets take place on a Monday. As Spilsby is located within a predominantly agricultural area, much of the market produce consists of locally grown vegetables and meat.
The population of the town was 2,336 in the 2001 census.