Ranby is a village and civil parish in the East Lindsey district of Lincolnshire, England. It is situated about north-west from the market town of Horncastle. It is in the civil parish of Market Stainton.
"Randebi" is listed in the 1086 Domesday Book, consisting of 29 households, a mill and one church.
The parish church, a Grade II listed building dedicated to Saint German (Saint Germain), dates from the 12th century, although it was rebuilt in 1861 by James Fowler reusing earlier fragments.
Ranby Hall is a Grade II listed brick country house dating from 1868.