Somerby is a hamlet in the West Lindsey district of Lincolnshire, England. It is situated 2 miles (3.2 km) south-east from the town of Gainsborough, and lies in the civil parish of Corringham. Excavations at Somerby in 1957 showed it was once larger, revealing 15th-century streets and house foundations, with finds ranging from the 12th to the 16th century. Much of the medieval village of Somerby was the site of an ancient deer park which belonged to Somerby Park mansion. Somerby Park is described in the 1872 Whites Directory as "a commodious ancient mansion in the Elizabethan style".