| Type: | Bishop |
| William Wharton Cassels | |
| Bishop of Western China | |
| Church: | Church in China |
| Diocese: | Western China |
| Enthroned: | 1895 |
| Term End: | 1925 |
| Successor: | Howard Mowll |
| Consecration: | 18 October 1895 |
| Consecrated By: | Edward White Benson |
| Birth Date: | 11 March 1858 |
| Birth Place: | Oporto, Kingdom of Portugal |
| Death Place: | Paoning, Szechwan, Republican China |
| Buried: | St John's Cathedral, Paoning |
| Nationality: | British |
| Religion: | Anglican |
| Parents: | John Cassels Ethelinda Cox |
| Spouse: | Mary Louisa Legg |
| Children: | Harold Cassels |
William Wharton Cassels (11 March 1858 – 7 November 1925) was an Anglican missionary bishop.
Cassels was born in Oporto, Portugal, the sixth son of John Cassels, a merchant, and Ethelinda Cox, a distant relation of Warren Hastings. He was educated at Percival House School, Repton School[1] and St John's College, Cambridge.
He was ordained[2] deacon (Rochester) on 4 June 1882 and priest on 10 June 1883.[3] He was a curate at All Saints' South Lambeth from 1882 to 1885. A member of the famous ‘Cambridge Seven’,[4] he joined the China Inland Mission in 1885, together with Arthur T. Polhill-Turner and Montagu Proctor-Beauchamp, the three established a proper Church of England diocese in Szechwan.[5] In 1895, he became the Bishop of Western China (West China Diocese).[6] One of the foremost missionaries of his time, who possessed great gifts of organisation, he understood the Chinese and was held in great veneration by them.
Cassels married Mary Louisa Legg, daughter of Edward Legg, at Holy Trinity Cathedral in Shanghai, on 4 October 1887. They had several children. He died on 7 November 1925 at Paoning, Szechwan,[7] buried in the garden of St John's Cathedral of Paoning. Mrs Cassels died eight days later. He had a son Harold Cassels born in Szechwan.