Philippe Gustave Doulcet, Comte de Pontécoulant (1795–1874) was a French astronomer.

He was the younger son of Louis Gustave le Doulcet, Comte de Pontécoulant and was the brother of Louis-Adolphe Pontécoulant.

Following his retirement he dedicated himself to the study of mathematics and astronomy.

In 1829 he used the mathematical methods of Poisson and Lagrange to successfully predict the return of Halley's comet with good precision.

His prediction of the perihelion passage was correct to within two days.