Line of succession to the Dutch throne

Unlike other monarchies of that time, Salic law was not applied in the Netherlands from the conception of the monarchy in 1814. The 1814 constitution states that the oldest son of the monarch would succeed him (or otherwise his grandson), followed by the monarch's brother or "his" son. Only when there would be a complete lack of males in his near family, would the oldest daughter of the monarch succeed him. The constitution of 1887 changed this slightly to give the King's daughter precedence over the King's brother, adopting agnatic-cognatic primogeniture.

In 1884 King William III's last male heir died, making Princess Wilhelmina heiress presumptive. William III was also Grand Duke of Luxembourg, but since Salic law was applied in that country, William was succeeded there by Adolphe, his distant relative. After 1884 no males were born into the royal family until 1967. In 1983 the Netherlands adopted full lineal primogeniture (the eldest child is heir).

For the succession of HM Queen Beatrix the following order of priority applies:
#HRH The Prince of Orange, Prince of the Netherlands, Prince of Orange-Nassau, Jonkheer van Amsberg (eldest child of the Queen)
#HRH Princess Catharina-Amalia of the Netherlands, Princess of Orange-Nassau (first child of the Prince of Orange)
#HRH Princess Alexia of the Netherlands, Princess of Orange-Nassau (second child of the Prince of Orange)
#HRH Princess Ariane of the Netherlands, Princess of Orange-Nassau (third child of the Prince of Orange)
#HRH Prince Constantijn of the Netherlands, Prince of Orange-Nassau, Jonkheer van Amsberg (third child of the Queen)
#Countess Eloise of Orange-Nassau, Jonkvrouw van Amsberg (daughter of Prince Constantijn)
#Count Claus-Casimir of Orange-Nassau, Jonkheer van Amsberg (son of Prince Constantijn)
#Countess Leonore of Orange-Nassau, Jonkvrouw van Amsberg (daughter of Prince Constantijn)
#HRH Princess Margriet of the Netherlands, Princess of Orange-Nassau, Princess of Lippe-Biesterfeld (third daughter of the late Queen Juliana of the Netherlands and sister to Queen Beatrix)
#HH Prince Maurits of Orange-Nassau, van Vollenhoven (son of Princess Margriet)
#HH Prince Bernhard of Orange-Nassau, van Vollenhoven (son of Princess Margriet)

Thus, after Willem-Alexander come his daughters; then Constantijn, his brother; a niece, a nephew, and another niece; an aunt; and two cousins.

Notes
* The Queen's second son, Prince Friso of Orange-Nassau, was removed from the line of succession in 2004 when he married without seeking parliamentary approval. His two daughters, Countess Luana and Countess Zaria are not in the line of succession.
* Prince Pieter-Christiaan of Orange-Nassau, van Vollenhoven and Prince Floris of Orange-Nassau, van Vollenhoven (the two younger sons of Princess Margriet) were removed from the list because they had both decided not to seek parliamentary approval for their 2005 marriages, which is necessary for being eligible for succession.
* Two of Queen's sisters, Princess Irene and Princess Christina, were also removed from the list when they both married without seeking parliamentary approval.
* The children of Prince Maurits and Prince Bernhard are not on the list, because their kinship with the Queen is of the fourth degree, the constitutional maximum being of the third degree.
* For the same reason, if Willem-Alexander becomes king as expected, then for his succession only numbers 2 through 9 apply (and possible future children of his and of Prince Constantijn); his cousins (numbers 10 - 11) will be removed from the list.