Princess Madeleine of Sweden, Duchess of Hälsingland and Gästrikland, (Madeleine Thérèse Amélie Joséphine; born on 10 June 1982 in Drottningholm, Sweden), is a Swedish princess. She is the youngest child and second daughter of King Carl XVI Gustaf and Queen Silvia of Sweden. Madeleine is seventh in line to the Swedish throne.

Princess Madeleine is married to British financier Christopher O'Neill. The couple has three children, Princess Leonore, Prince Nicolas, and Princess Adrienne.