South Ormsby, sometimes called South Ormesby, is a village in the East Lindsey district of Lincolnshire, England. It is situated 1 mile (1.6 km) west from the A16 road, 7 miles (11 km) south from Louth and 7 miles north-east from Horncastle. With the nearby hamlet of Ketsby, it forms the civil parish of South Ormesby with Ketsby. The population is included in the civil parish of Brinkhill.

South Ormsby
St Leonard's Church, South Ormsby
South Ormsby Location within Lincolnshire
OS grid reference	TF369757
• London	125 mi (201 km) S
District	East Lindsey
Shire county	Lincolnshire
Region	East Midlands
Country	England
Sovereign state	United Kingdom
Post town	Louth
Postcode district	LN11
Police	Lincolnshire
Fire	Lincolnshire
Ambulance	East Midlands
UK Parliament	Louth and Horncastle
List of places UK England Lincolnshire 53°15′41″N 0°03′07″E / 53.261365°N 0.051890°E / 53.261365; 0.051890

The 15th-century church of St Leonard's is approached by a short climb up a path next to the old school house.

Ormsby Hall, built by James Paine in 1752, stands in a wooded parkland complete with lake.

The village has a public house, the Massingberd Arms, and a motor repair garage.

The Greenwich Prime Meridian line passes through the village.