Elsa Viktoria Olenius (September 30, 1896 – August 25, 1984) was a Swedish librarian and writer, best remembered for pioneering children's library activities and theatre with children. She was awarded a Gulliver Prize in 1981.
In the 1940s, she founded Barnens egen teater ('the Children's Own Theatre'), which later became Vår teater ('Our Theatre').
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