Yves Henri Donat Mathieu-Saint-Laurent, referred to as Yves Saint Laurent or YSL, was a French fashion designer who, in 1962, founded his eponymous fashion label. He is regarded as being among the foremost fashion designers of the twentieth century. In 1985, Caroline Milbank wrote, "The most consistently celebrated and influential designer of the past twenty-five years, Yves Saint Laurent can be credited with both spurring the couture's rise from its 1960s ashes and with finally rendering ready-to-wear reputable."

Yves Saint Laurent SAS, also known as Saint Laurent and YSL, is a French luxury fashion house founded in 1962 by Yves Saint Laurent and his partner, Pierre Bergé. The company specializes in haute couture, ready-to-wear, leather accessories, and footwear. Its cosmetics line, YSL Beauty, is owned by L'Oréal.