Samuel Greg (born 26 March 1758 – died 4 June 1834) was a British entrepreneur of the early Industrial Revolution and a pioneer of the factory system. He built Quarry Bank Mill, which at his retirement was the largest textile mill in the country. 
He was married to Hannah Lightbody. 
- "Samuel Greg and the beginnings of Quarry Bank". National Trust. Retrieved 2020-07-09.
- "Hannah Lightbody (1767–1828), Mrs Samuel Greg (?) | Art UK". artuk.org. Retrieved 2020-07-09.