East Firsby and West Firsby are two hamlets in the West Lindsey district of Lincolnshire, England. They are situated about north from the city of Lincoln, and set in the Lincolnshire Wolds, a designated Area of Outstanding Natural Beauty.
East Firsby lies between Saxby and Spridlington, with West Firsby about to the west, near the A15 road. East Firsby civil parish was abolished to enlarge that of West Firsby in 1936. There is no church.
The hamlet of Firsby is listed in the 1086 Domesday Book as "Frisebi", with 22 households, of meadow and a church, with Ilbert of Lacy as Lord of the Manor.
The Manor House at West Firsby fell into disrepair and was demolished during the 1990s. At East Firsby is the mid 18th-century Grade II listed Manor Farmhouse, and at West Firsby is a site of a deserted medieval village.
There is an oilfield at West Firsby.