William Placid Morris OSB (29 September 1794 – 18 February 1872) was a London-born Roman Catholic bishop.
To that end, Morris was appointed Titular Bishop of Troas in October 1831, receiving episcopal ordination on 5 February 1832.
The investigation, however, was rendered otiose by the impromptu flight of Slater from Port Louis in June 1832 and his death from exposure a few days later.
Unhappily for Morris, those documents were never lodged and in 1840 he was peremptorily recalled to Rome and relieved of his post as Vicar Apostolic of Mauritius.
He retired to England and until his death in 1872 served in effect as an auxiliary bishop to the first two Cardinal Archbishops of Westminster, Nicholas Wiseman and Henry Edward Manning.