Josué Dubois Berthelot de Beaucours (ca 1662 – May 9, 1750) was a military officer in New France, chief engineer of Canada and governor of Trois-Rivières and Montreal.
In 1687, he was discharged from the naval service and, the following year, became a lieutenant in the colonial regular troops of Canada.
In 1689, he was charged with improving the defences of the town of Trois-Rivières due to the threat of attacks by the Iroquois.
In 1704 and 1705, he led a group of 120 men which took part in an expedition against the English in Newfoundland that culminated in the Siege of St. John's.
On his return, Beaucours continued to work on fortifications at Montreal and Quebec City and, in 1712, he was awarded the cross of Saint-Louis and named chief engineer for Canada.