Petite bibliothèque ronde, Children's library in Clamart, France

La Petite Bibliothèque Ronde is a children's library in Clamart designed by the Atelier de Montrouge — Gérard Thurnauer, Jean Renaudie, Jean-Louis Véret and Pierre Riboulet — and opened in 1965. Its reading rooms are round, with shelves curved against the walls, and most of the furniture was designed by Alvar Aalto. The single-storey building has pale textured walls, a band of dark-framed windows across the upper facade, and a glazed entrance door recessed behind concrete steps, with a dark wooden trellis fence to the right.

The library was founded in 1965 with support from Anne Gruner-Schlumberger as sponsor. By 1972, it gained state funding and became a national center for children's literature.

The name "La Joie par les livres" (joy through books) came from the founding association. From 1976 the library granted two annual bursaries to librarians from abroad, who chose titles from their home countries, presented them to the children and relayed the reactions to French publishers. The collection was built as "the best picture books from around the world, presented in their original language".

The library sits in the Cité de la Plaine in Petit-Clamart, in a working-class neighbourhood of Clamart. It is open to children nearly every day of the week, Sunday included. The entrance is reached by a short set of concrete steps set back from the white facade, beside a dark wooden trellis fence.

Finnish designer Alvar Aalto created the interior furnishings, combining durability with bright colors throughout the space. The entire interior deliberately avoids right angles, creating an unusual flowing environment.