Gaudensi Allar (February 17, 1841 – August 22, 1904) was a French architect.

In 1854, he served aboard a ship in the Crimean War.

[1] His first architectural work was the Ecole Rouvière, a primary school located at 83 Boulevard Redon in Marseille; his brother sculpted the facade.

[3] In 1893–1894, he restored the Église Dormition de la Mère de Dieu, a Greek Orthodox church located at 23 Rue de la Grande Armée in the 1st arrondissement of Marseille.

[4] He also designed a building located at 15 rue Honnorat in Marseille, known as the Foyer social Honnorat or the Fondation Massabo-Zafiropulo.