Woolsthorpe-by-Colsterworth
Birthplace of Sir Isaac Newton
Woolsthorpe-by-Colsterworth Location within Lincolnshire
OS grid reference	SK925244
• London	95 mi (153 km) SSE
Civil parish	Colsterworth
District	South Kesteven
Shire county	Lincolnshire
Region	East Midlands
Country	England
Sovereign state	United Kingdom
Post town	Grantham
Postcode district	NG33
Police	Lincolnshire
Fire	Lincolnshire
Ambulance	East Midlands
UK Parliament	Grantham and Stamford
List of places UK England Lincolnshire 52°48′36″N 0°37′44″W / 52.809863°N 0.628770°W / 52.809863; -0.628770

Woolsthorpe-by-Colsterworth (to distinguish it from Woolsthorpe-by-Belvoir in the same county) is a hamlet in the South Kesteven district of Lincolnshire, England, within the civil parish of Colsterworth. It is best known as the birthplace of Sir Isaac Newton.

Woolsthorpe-by-Colsterworth is 1 mile (2 km) northwest of the village of Colsterworth on the A1 road. Woolsthorpe is three miles from the county boundary with Leicestershire and four miles from the county boundary with Rutland.

Woolsthorpe lies in rural surroundings. It sits on Lower Lincolnshire Limestone, below which are the Lower Estuarine Series and the Northampton sand of the Inferior Oolite Series of the Jurassic period. The Northampton Sand here is cemented by iron and in the 20th century the hamlet was almost surrounded by strip mining for iron ore. In 1973 the local quarries closed due to competition from imported iron ore. The same year the Great Northern Railway's High Dyke branch line closed – it was opened in 1916 to carry iron ore, and lay to the north of the village. There was an unsuccessful attempt to preserve the line.

Woolsthorpe Manor, Newton's birthplace, is a typical 17th-century yeoman farmer's limestone house, with later farmyard buildings. It is owned by the National Trust and is open to the public.

• Media related to Woolsthorpe-by-Colsterworth at Wikimedia Commons
• Woolsthorpe by Colsterworth page in the website of England's Local Heritage Initiative
• Railways and quarries around Woolsthorpe by Colsterworth in 1963