John Wynne (1650 – 31 December 1714) was a Welsh industrialist, who tried but failed to turn the place where he was born into a centre of the lead industry.
Wynne was born in Trelawnyd (a hamlet of 10 houses near Diserth) in Flintshire, north Wales.
Like his father before him (who was also called John), he was educated at Jesus College, Oxford, from 1668, joining Gray's Inn in the following year.
He thought that Trelawnyd had a role to play in the lead industry and drew up plans to turn it into an industrial town of some importance, building various houses and public buildings (including a non-conformist chapel) and obtaining permission to rename it as "Newmarket" in 1710.
He left money in his will to establish a grammar school in Newmarket to teach Latin, Greek, French, mathematics and navigation.