Pierre Marcilhacy (14 February 1910, Paris – 6 July 1987) was a French lawyer and public figure.
It was then that he met his wife Gabrielle van Heutz (Kinny), a Dutch woman.
In 1965 he ran against Charles de Gaulle in the French presidential election as candidate of the European Liberal Party, a small centrist liberal group.
In the runoff election he supported François Mitterrand, who was born in the same town, Jarnac.
Marcilhacy is remembered as one of a number of widely diverse candidates – from both the left and the right – who stood against de Gaulle in 1965.