Parc des Sources de la Bièvre, Urban park in Guyancourt, France.

Parc des Sources de la Bièvre is a 60-hectare green space in Guyancourt, Yvelines, laid out in 1975 by landscape architect Paul Soun and architect Bertrand Lemoine. It runs from the Saint-Quentin-en-Yvelines shopping centre to the Bièvre valley, a site classified since 7 July 2000. Its Jardin du Parc holds a hedge maze, children's play areas and a rose garden arranged along an urban water line.

The park was designed in 1975 by landscape architect Paul Soun and architect Bertrand Lemoine for the Parc district of Guyancourt. The Roussières pond was created in the 1970s to regulate stormwater from the new urban areas. In 1999 Dani Karavan laid out the Carré urbain, replacing a planned white tower abandoned because of construction and running costs. The Bois des Roussières appears on the 1787 intendance plan as "plan de Trou".

The park's name is misleading: sources record that this green space was simply called "le Parc", attached to Guyancourt's Parc district, and that "parc des Sources de la Bièvre" is a false formulation. The actual Bièvre source lies at the hamlet of Bouviers, reachable on foot via a footbridge from the Jardin de l'Aqueduc. Near the maze, two ponds shown on the 1787 plan de Trou still exist.

The main entrance is on Boulevard Vauban, between Massimiliano Fuksas's Maison de la communication and the Guyancourt university library by Jacques Ripault and Denise Duhart. From there the water flowing out of Marta Pan's sculptures leads into the park. A footbridge from the Jardin de l'Aqueduc reaches the hamlet of Bouviers, where the Bièvre spring rises.

The large pond at the center manages rainwater runoff from surrounding developed areas, serving both as a natural feature and a functional system. This dual role demonstrates how water management and recreation are woven together in the park's design.