La Serre aux papillons, Butterfly sanctuary in La Queue-les-Yvelines, France.

La Serre aux papillons is a butterfly sanctuary housed in a greenhouse facility within Poullain Garden Center, where hundreds of tropical butterflies fly freely in a temperature-controlled environment. Visitors walk among exotic flowers and plants while colorful insects flutter around them.

La Serre aux Papillons opened in 1989 in La Queue-les-Yvelines. In 2013 it was the eighth most visited site in Yvelines outside the Versailles estate, and it later joined the Route Nature en Yvelines, an association of the ten largest tourist sites in the department. It is the largest butterfly greenhouse in France.

The name refers to the greenhouse structure where visitors observe butterflies in settings that resemble their natural habitats. The spaces are designed to allow the creatures to fly freely and display their typical behaviors.

The greenhouse sits in the Haute Vallée de Chevreuse regional park, 30 minutes west of Paris and 15 minutes from Versailles, reachable by the N12 road or by train to Garancières-La Queue station. It opens from late February to mid-November, and a visit takes between 1 and 1.5 hours. Inside, expect an average of 28 °C and humidity of 80–83%.

The two largest butterfly species in the world live here: the Atlas moth (Attacus atlas) and the comet moth (Argema mittrei). None are taken from the wild; all come from approved breeders, and about 90% of the chrysalises hatch into correctly formed adults, a higher rate than in nature.