Rudolf Koivu (1890–1946) was a Finnish illustrator and painter, best known for illustrating books of fairytales for children, which are enduringly and timelessly popular.

He illustrated stories by Zacharias Topelius, Anni Swan and Hans Christian Andersen, among others.

In his honor, the Rudolf Koivu Prize was established in 1949.

It is awarded biennially to Finnish illustrators of children's books.

This article about a Finnish painter is a stub.