Pierre Thuillier was a French painter.

Pierre Thuillier was a landscape painter, first a pupil of Louis Étienne Watelet then belonging to the School of Barbizon. He carried out his first artistic activity in the region of Amiens and around the Forest of Fontainebleau between 1831 and 1832. As a young apprentice at the atelier of Watelet he met Théodore Caruelle d'Aligny and left with him later to work in Italy. Later he often stayed in Germany, Switzerland, Italy and Algiers, moving along Maghreb, and then returned to paint in France, particularly in Auvergne.

In 1843 he was made a Chevalier of the Legion d'Honneur.