Princess Nathalie of Sayn-Wittgenstein-Berleburg is a Danish equestrian, an Olympian, and the daughter of Princess Benedikte of Denmark and Prince Richard of Sayn-Wittgenstein-Berleburg. She is the niece of Queen Margrethe II of Denmark and King Constantine II of Greece. Her first cousin is King Frederik X of Denmark.

Princess Benedikte of Denmark, Princess of Sayn-Wittgenstein-Berleburg is a member of the Danish royal family. She is the second daughter and child of King Frederik IX and Queen Ingrid of Denmark. She is the younger sister of Queen Margrethe II of Denmark, and therefore the aunt of Margrethe's son, the current King of Denmark, Frederik X. She is also an older sister of Queen Anne-Marie of Greece.