Marie Thérèse Françoise Boisselet (1731 – 1800) was a petite maîtresse of King Louis XV of France.
Marie Thérèse Françoise Boisselet was described as a beauty, and she agreed to become the lover of the king.
The affair was not an official one; she was recruited to be a petite maîtresse (unofficial mistress) of the king in Parc-aux-Cerfs.
In 1771, she married the chemist Louis Claude Cadet de Gassicourt, who adopted her son.
According to Paul Thiébault, Louis XV benefitted the career of Cadet de Gassicourt in the Royal Academy because of his marriage to his former lover.