Iona Archibald Opie, CBE, FBA (born 13 October 1923) and Peter Mason Opie (25 November 1918 – 5 February 1982) were a married team of folklorists, who applied modern techniques to children's literature, summarized in their studies The Oxford Dictionary of Nursery Rhymes (1951) and The Lore and Language of Schoolchildren (1959). They are also noted anthologists, and assembled large collections of children's literature, toys, and games.