Percy Umfreville Henn (21 January 1865 – 25 February 1955) was a clergyman and teacher in England and later Western Australia.

Henn was educated at Christ's Hospital, London, as a bluecoat boy, and then at Worcester College, Oxford, on a scholarship.

He returned to England and became organising secretary in the Society for the Propagation of the Gospel in the dioceses of Canterbury and Rochester.

[1]In 1910, Henn returned to Perth to take up the position of Headmaster of Guildford Grammar School.

Henn immediately sent out a circular entitled "A Church of England Secondary School for Western Australia."

[5][6] In 1918, Henn suggested that Christ Church Grammar School's oval be widened and made a first-class playing field.

[5] In 1912, a Cecil Priestley was temporarily employed by Henn as a member of the Guildford Grammar School staff.

[4] Henn left his job as Headmaster at Guildford Grammar School in 1925 and returned to England.

Henn's ashes reside in the Guildford Grammar School Chapel, with a stone slab to commemorate this situated on the north side of the sanctuary.