The Institut d'astrophysique spatiale (IAS; English: Institute of Space Astrophysics) is a French research institute supporting advanced research in aerospace and astrophysics. It is located in Orsay, just south of Paris. It is a public research institute in a partnership with the University of Paris-Saclay.

• Pierre Cox, a French astronomer
• Jean-Loup Puget, a French astrophysicist

• Official website

48°41′58″N 2°10′29″E / 48.6994819°N 2.1748245°E / 48.6994819; 2.1748245