Sylvie Vauclair (born on March 7, 1946, in Saint-Germain-en-Laye) is a French astrophysicist (at the Institut de Recherche en Astrophysique et Planétologie), and professor emeritus (at the Toulouse III - Paul Sabatier University), where she taught for more than 30 years.

[4][5] She particularly studied the importance of the selective diffusion of atoms in stellar conditions and its consequences for their structure and evolution.

She has made important contributions to helioseismology and asteroseismology by studying the influence of the detailed internal chemical composition on the observed frequencies.

[7][8][9][10] An international symposium was held in her honor in 2013, on the topic of interactions between microscopic (atomic) and macroscopic (hydrodynamic) phenomena occurring in stars.

She is interested in the relationship between philosophy, art and science and participates in many transdisciplinary events and in social debates.