Robert William Stanley Mercer CR (born 10 January 1935) is a Roman Catholic priest in England.
Mercer was educated at Grey High School, Port Elizabeth and St Paul’s Theological College, Grahamstown.
In 1970, he was deported from South Africa because of his stand against apartheid, specifically for running, with other Anglican clerics, a multi-racial parish at Stellenbosch University.
[3] Though retired to England, he remained a member of the Anglican Catholic Church of Canada's house of bishops until January 2012.
[4] On 27 March 2012, he was ordained a Catholic priest by Bishop Alan Hopes in the Cathedral of St John the Evangelist, Portsmouth.