Reverend Canon Percy Umfreville Henn (b. 21 January 1865 in Manchester, England; d. 25 February 1955 in Perth, Western Australia) was a clergyman and teacher in England and later Western Australia. He is best known for his time as Headmaster at Guildford Grammar School and later for the building of the Chapel of SS. Mary and George. Henn gained his BA in 1887 and MA in 1890 from Worcester College at Oxford University. He taught at various schools until 1900, when he became a missionary in Western Australia in country towns. After further religious work in regional WA, he moved to Guildford, Western Australia and became a leading force behind Guildford Grammar School's chapel and preparatory school. He died in 1955 at age 90.