William Mohun

1540 – 6 April 1588) of Hall in the parish of Lanteglos-by-Fowey and of Boconnoc, both in Cornwall, was a Member of Parliament.

[2] His great-grandfather William Mohun of Hall had married Elizabeth Courtenay, one of the greatest heiresses of her time, one of the four eventual co-heiresses of Edward Courtenay, 1st Earl of Devon (1527–1556) the last of the mediaeval Courtenay Earls of Devon.

The Mohun share of the Courtenay inheritance included Boconnoc in Cornwall and Okehampton Castle in Devon, and other remnants of the feudal barony of Okehampton, one of the earliest possessions of the Courtenays.

He was elected Member of Parliament for St Germans (1563–1567) and Cornwall (2 April 1571 – 29 May 1571).

He served as Lord Lieutenant of Cornwall from 8 August 1586 to 7 December 1587.