Princess Madeleine of Sweden, Duchess of Hälsingland and Gästrikland (Madeleine Thérèse Amelie Josephine; born 10 June 1982), is the second daughter and youngest child of King Carl XVI Gustaf and Queen Silvia. Upon her birth, she was third in line of succession to the Swedish throne. She is currently seventh in the line of succession. Princess Madeleine is married to British-American financier Christopher O'Neill. They have three children, Princess Leonore, Prince Nicolas and Princess Adrienne.

Madeleine was born on 10 June 1982 at 19:05 CEST at Drottningholm Palace and is a member of the Swedish Royal Family from the House of Bernadotte. She was christened at The Royal Palace Church on 31 August 1982, her godparents being her father's maternal cousin the Hereditary Prince of Saxe-Coburg and Gotha, her maternal uncle Walther L. Sommerlath, her father's paternal cousin Princess Benedikte of Denmark, and her paternal aunt Princess Christina, Mrs Magnuson. She was given the honorary title of Duchess of Hälsingland and Gästrikland. It was the first time since the early 17th century (when such titles were still more than honorary) that a Swedish ducal title included more than one province.