Annika Sandelin (b. 1972) is a Finnish-Swedish writer from Helsinki. She has published poems, a novel and children's and youth books in Swedish. Sandelin is also a translator and librarian. A significant part of her works have been published not only in Swedish, but also in Finnish translations. She is the author of the fun accordion-shaped picture book for toddlers Sano hi!, published by Etana Editions (translated by Tittamari Marttinen). The illustrator of the book is Linda Bondestam .