| Richard Deodatus Poulett-Harris | |
| Birth Date: | 26 October 1817 |
| Birth Place: | Cape Breton Island, Nova Scotia, Canada |
| Death Place: | Hobart, Australia |
| Occupation: | Educationalist, reverend |
| Spouse: | Catherine Prior Hall; Elizabeth Eleanor Milward |
Richard Deodatus Poulett-Harris (26 October 1817 – 23 December 1899) was an educationalist in England and Tasmania.
Harris was born on Cape Breton Island, Nova Scotia, Canada, the eldest son of Captain Charles Poulett Harris of the 60th Rifles Regiment, who was stationed there. His mother was Anna Maria, daughter of Richard Stout, judge and member of the governor's council on Cape Breton Island. Harris was descended from Sir Amias Poulett, English ambassador to France in the reign of Queen Elizabeth I and afterwards keeper of Mary, Queen of Scots.
Harris was educated from 1837 at the Manchester Free Grammar School and from 1839 Trinity College, Cambridge where he graduated B.A. with honours in 1843, and M.A. in 1852.