They authored about 25 books including: • Peter Opie, 1946,
The Case of Being a Young Man, a discursion (Chosen Books, competition prize winner) • Iona and Peter Opie, collectors and editors, 1947.
I Saw Esau: Traditional Rhymes of Youth (Williams & Norgate Ltd) • Iona and Peter Opie, editors, 1951.
The Oxford Dictionary of Nursery Rhymes (Oxford University Press) • Iona and Peter Opie, 1959,
The Lore and Language of Schoolchildren (Oxford University Press) • Iona and Peter Opie, 1963,
The Puffin Book of Nursery Rhymes (Penguin/Puffin) • Iona and Peter Opie, 1969, ''Children's Games in Street and Playground'' (Oxford University Press) • Iona and Peter Opie, editors, 1974.
The Classic Fairy Tales (Oxford University Press). Presents the texts of twenty-four familiar
fairy tales as they were first published in English; summarises the history of each tale, especially from the textual point of view. • Iona and Peter Opie, 1985.
The Singing Game (Oxford University Press). • Iona and Peter Opie, 1988.
Tail Feathers of Mother Goose (Little Brown & Company). • Iona Opie, 1993.
The People in the Playground. (Oxford University Press). • Iona and Peter Opie, 1997. ''Children's Games with Things'' (Oxford University Press). • Opie, Iona, and Moira Tatem, eds. 1989,
A Dictionary of Superstitions. Oxford: Oxford University Press, ==See also==