Catharina-Amalia, Princess of Orange (Catharina-Amalia Beatrix Carmen Victoria; born 7 December 2003), is the heir apparent to the throne of the Kingdom of the Netherlands, consisting of the countries of the Netherlands, Curaçao, Aruba, and Sint Maarten.

Princess Catharina-Amalia is the eldest child of King Willem-Alexander and Queen Máxima. She became heir apparent when her father ascended the throne on 30 April 2013.

Princess Catharina-Amalia Beatrix Carmen Victoria was born at 17:01 CET on 7 December 2003 in the Bronovo Hospital in The Hague, as the first child of the then-Prince Willem-Alexander and Princess Máxima. After her birth was made public, 101 salute shots were fired at four places in the Kingdom of the Netherlands: Den Helder and The Hague in the Netherlands, Willemstad in the Netherlands Antilles, and Oranjestad in Aruba.

On 12 June 2004, Catharina-Amalia was baptised by Reverend Carel ter Linden in the Great Church in The Hague. Her godparents are her uncle Prince Constantijn, Crown Princess Victoria of Sweden, the (then) vice-president of the Council of State of the Netherlands Herman Tjeenk Willink, friend of her mother Samantha Deane, her uncle Martín Zorreguieta, and friend of her father Marc ter Haar.

Princess Catharina-Amalia has two younger sisters: Princess Alexia (born in 2005) and Princess Ariane (born in 2007). She lives with her parents and sisters in Villa Eikenhorst on the estate De Horsten in Wassenaar. The family will move to Huis ten Bosch in The Hague in the future.

Since 10 December 2007, Catharina-Amalia has attended the public primary school Bloemcampschool in Wassenaar. She now attends the Christelijk Gymnasium Sorghvliet in the Hague, where her aunt Princess Laurentien attended.

Her birthdays are traditionally celebrated with a concert at the Kloosterkerk in The Hague, which is attended by ambassadors and members of the royal household and the Council of State of the Netherlands. She speaks Dutch, English, and some Spanish.

On her seventh birthday, a Douglas C-47 Skytrain once owned by her great-grandfather, Prince Bernhard of Lippe-Biesterfeld, was named after Catharina-Amalia by Peter Hartman. The princess herself was prevented from attending the naming ceremony by school obligations.

Catharina-Amalia was one of the bridesmaids at the wedding of her godmother, Crown Princess Victoria of Sweden, and Daniel Westling; which took place in June 2010 at Stockholm Cathedral.

Queen Beatrix abdicated on 30 April 2013, and Catharina-Amalia, as the heir apparent to her father, assumed the title of Princess of Orange, becoming the first to do so in her own right (suo jure) since Mary of Baux-Orange in 1417. Princess Catharina-Amalia will assume a seat in the Advisory Division of the Council of State of the Netherlands upon reaching the age of majority at 18