Jean Beausire (French pronunciation: [ʒɑ̃ boziʁ]; 26 February 1651 - 20 March 1743) was an architect, engineer and fountain-maker and the chief of public works in Paris for King Louis XIV of France and King Louis XV of France between 1684 and 1740, and was the architect of all the public fountains constructed in Paris that period.
Marie Roman died in 1679, and the following year Beausire remarried to Marie-Catherine Le Trotteur, the daughter of a wealthy merchant.
In 1706 he was given a new title, Maître Général, Contrôleur et inspecteur des bâtiments, in charge of all the fountains in Paris.
Among his projects was the transformation of the old walls of the city into parks planted with trees (1670); installing a statue of Louis XIV in front of the Hotel de Ville (1689); the development of Place Vendôme and Place des Victoires; building a barracks for the royal Musketeers on rue Chareton; rebuilding the Petit Pont after it burned (1718-1719), and creating a whole new neighborhood between the rue des Filles-du-Calvaire and the rue du Temple.
For instance, in 1717 his daughter Catherine-Elisabeth Beausire married Barthélémy Bourdet, one of the most successful architects in Paris.