Gun's Mills, at Flaxley, in the Forest of Dean, Gloucestershire, England, was a major industrial site from the 17th century.

[1] In the early 17th century, Sir John Winter (a.k.a Wintour/Wynter), a local ironmaster established an armaments foundry at the site.

[1] Winter, a staunch Royalist and private secretary to Henrietta Maria, wife of Charles I, became a major supplier of weaponry to the king's forces.

[8] In the 21st century, the mill site was acquired by the Forest of Dean Buildings Preservation Trust,[9] which is undertaking restoration.

[10] The main mill was covered in scaffolding and tarpaulin for over 20 years, for preservation while restoration funding was sought, but a grant from Historic England in 2023 has enabled some progress.