The Paris-Saclay Faculty of Sciences or Orsay Faculty of Sciences, in French : Faculté des sciences d'Orsay, is the mathematics and physics school within Paris-Saclay University, founded in 1956. It offers undergraduate and graduate degrees in mathematics, physics and chemistry (though its undergraduates are officially enrolled in Paris-Saclay Undergraduate School). Previously the Paris-Sud Faculty of Sciences, the School assumed its current structure in 2019. Christine Paulin-Mohring has been the School's dean since 2016.