Pierre Saint-Julien (October 26, 1765 – 1827 or later) was a farmer and political figure in Lower Canada.
He represented York in the Legislative Assembly of Lower Canada from 1809 to 1814.
He was born in Pointe-Claire, the son of Joseph Saint-Julien and Marie-Joseph Aumay.
Saint-Julien farmed at Vaudreuil where his parents moved around 1778, then at Rigaud and later at L'Orignal in Upper Canada.
Saint-Julien died some time after 1827, possibly in L'Orignal.