Gaspard Thomas Ulliel (25 November 1984 – 19 January 2022) was a French actor. He was known for portraying the young Hannibal Lecter in Hannibal Rising (2007), fashion designer Yves Saint Laurent in the biopic Saint Laurent (2014), and for being the face of the Chanel men's fragrance Bleu de Chanel. He also voiced Jack Frost in the French version of Rise of the Guardians (2012), and portrayed Anton Mogart in the Disney+ miniseries Moon Knight (2022).

Ulliel made his feature film debut in Brotherhood of the Wolf (2001), and had his breakthrough in Strayed (2003). He was nominated for the César Award for Most Promising Actor for three consecutive years for his performances in Summer Things (2002), Strayed (2003), and A Very Long Engagement (2004); winning that award in 2005 for his performance as World War I soldier Manech in A Very Long Engagement. In 2015, he earned his first César nomination for Best Actor for his performance in Saint Laurent. In 2017, he won the César Award for Best Actor for his role as a terminally ill playwright in It's Only the End of the World (2016). He became a Knight of the Order of Arts and Letters in France in 2015. His other notable works include films such as The Last Day (2004), Paris, je t'aime (2006), Jacquou le Croquant (2007), The Princess of Montpensier (2010), To the Ends of the World (2018), and the miniseries Twice Upon a Time (2019). Ulliel died on 19 January 2022, following a skiing accident at La Rosière resort in Savoie, France.