Simon Vollant (1 February 1622 – 1694) was a 17th-century French engineer, entrepreneur and architect ennobled in 1685.
Vollant built the citadel of Lille and became the most renowned fortifications builder for Vauban, Louvois and Louis XIV. He directed or controlled the principal works of fortifications of the cities, inspected the various fortresses of the north of the country and advised the generals.
As a civil architect, he built the Porte de Paris in Lille, considered by some to be a masterpiece. He drew the plans of the new district Saint-André de Lille. His advice was sought and followed for the channelling works of the Deûle and to bring the waters of the Eure to Versailles. He also designed and built hôtels particuliers, houses like those in Rang de Beauregard, various buildings and squares.