John Dynham, 1st Baron Dynham, KG of Nutwell in the parish of Woodbury and of Hartland, both in Devon, was an English peer and politician. He served as Lord High Treasurer of England and Lord Chancellor of Ireland. He was one of the few men to have served as councillor to Kings Edward IV, Richard III and Henry VII and was trusted by all of them.

Nutwell in the parish of Woodbury on the south coast of Devon is a historic manor and the site of a Georgian neo-classical Grade II* listed mansion house known as Nutwell Court. The house is situated on the east bank of the estuary of the River Exe, on low-lying ground nearly contiguous to the water, and almost facing Powderham Castle similarly sited on the west bank. The manor was long held by the powerful Dynham family, which also held adjacent Lympstone, and was according to Risdon the site of their castle until John Dynham, 1st Baron Dynham (1433–1501), the last in the male line, converted it into "a fair and stately dwelling house".