Paul Marciano (born ca. 1952) is an American fashion designer, businessman, investor, and philanthropist. He is the co-founder of Guess? Inc; his black-and-white advertisements have won numerous Clio awards. Initially run by all four Marciano brothers (Paul, Armand, Maurice and Georges), today the company and its extension lines, Marciano and G by Guess, are handled by Paul and Maurice. He is also a large benefactor to one of the larger Sephardic synagogues in Los Angeles, Em Habanim.