Christian Siriano (born November 18, 1985) is an American fashion designer. Siriano first gained attention after winning the fourth season of American reality show Project Runway, becoming the series' youngest winner. Shortly after winning Runway, Siriano launched his fashion line, Christian Siriano, which as of 2010 has brought in revenue of over $1.2 million.

Siriano was born and raised in Annapolis, Maryland. He has one older sister, and is of Italian and German descent.

Siriano has said that his parents supported the arts and encouraged him and his sister to pursue creative fields. As a child, Siriano studied ballet, and on a March 2008 Ellen appearance, he described himself as a "musical theater kid who loved costumes".Siriano's interest in costume design inspired him to pursue a career in fashion. He began designing clothes at age thirteen, while working as a hair washer and styling assistant at Bubbles Salon in Annapolis, and eventually began sewing clothes for the salon's annual hair shows. Siriano spent a year at Broadneck Senior High School before transferring to Baltimore School for the Arts. The school allowed Siriano to choose fashion design as his course of study.

After being rejected by the Fashion Institute of Technology, Siriano chose to study abroad at American InterContinental University in London, England. Following the recommendation of a teacher during his senior year, he began interning at Vivienne Westwood, and later, at Alexander McQueen, who Siriano has stated is his favorite designer. Siriano moved to New York City after graduating from college.