William Clarke College is an Anglican co-educational K-12 school founded in 1988. It is located in Kellyville, in the north-west of Sydney, New South Wales, Australia. The college takes its name from William Branwhite Clarke, an Anglican clergyman who arrived in Australia during 1839. He was a headmaster of The King's School Parramatta, the first incumbent of the Parish of Castle Hill, but is also remembered as a noted and respected geologist.