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.
Iona Margaret Balfour Archibald was born in Colchester, Essex, England. She is a researcher and writer on European folklore and children's street culture. She is considered an authority on children's rhymes, street & playground games and the Mother Goose tradition. She was elected a Fellow of the British Academy (FBA) in 1998 and was made a Commander of the Order of the British Empire (CBE) in 1999.
Peter Opie was born in Cairo, in the war-time British Protectorate or Sultanate of Egypt, and educated at Eton College. He was a specialist in children's literature, and the customs of schoolchildren. He was joint winner of the £1,000 Chosen Books competition, with his autobiographical discursion The Case of Being a Young Man (published in paperback, 1946).
The couple met during World War II and married in 1943. They worked together closely, from their home near Farnham, Surrey, conducting primary fieldwork, as well as library research, and interviewing thousands of children. In pursuing the folklore of contemporary childhood they directly recorded rhymes and games as they were currently being played. They collaborated on several celebrated books and, combined, produced over 30 works. They worked in their home in Alton, Hampshire. The couple were jointly awarded the Coote Lake Medal in 1960. The medal is awarded by The Folklore Society "for outstanding research and scholarship".