Spilsby was a rural district in Lincolnshire, parts of Lindsey from 1894 to 1974. It was created by the Local Government Act 1894 from the Spilsby rural sanitary district. It was reduced in 1896 when Alford was constituted an urban district and again in 1925 when the civil parish of Sutton in the Marsh became part of Mablethorpe and Sutton urban district and 1926 when the neighbouring Skegness Urban District was extended. In 1936 a County Review Order enlarged the district when it absorbed the former Sibsey Rural District.