Pieter van Vollenhoven Jr. (born 30 April 1939) is the husband of Princess Margriet of the Netherlands and a member, by marriage, of the Dutch royal house.

Van Vollenhoven attended secondary school in Rotterdam, and he subsequently studied law at the University of Leiden.

Following the Bijlmer and Hercules disasters, a need was felt in The Netherlands for a single body to investigate all transportation-related incidents; the Transportation Safety Council (Dutch: Raad voor de Transportveiligheid) was created, which incorporated the earlier Road Transportation Safety and Rail Incident Boards and also had Van Vollenhoven as chairman.

As Chairman of the Safety Board, Van Vollenhoven oversaw the investigation of the Schipholbrand, a fire in a holding facility for illegal immigrants in The Netherlands.

He presented a final report on 21 September 2006, with such devastating findings that ministers Piet Hein Donner and Sybilla Dekker resigned over it.

Citing that there was no reason at that time to suspect foul play and that the Board investigation would be hampered by the threat of legal action against persons, Van Vollenhoven absolutely refused this access.

[1] When he turned 70, Barry Sweedler (of the US National Transportation Safety Board) said to him: "The world is a safer place because of your work and leadership".

In 1986 he formed a trio – De Gevleugelde Vrienden – with two of the country's leading pianists (Pim Jacobs and Louis van Dijk) and gave some twenty concerts a year both at home and abroad in aid of the Victim Support Fund.