Petrus Johannes Idenburg (28 January 1898, Hillegersberg, Netherlands – 27 December 1989, The Hague) was a jurist specialized in constitutional law, lector at Leiden University, and researcher on Africa.

[1][2][3] He graduated in law in 1920 from the University of Amsterdam and continued his studies at the London School of Economics.

The idea of establishing a Dutch-Afrikaans law journal that would in 1936 become the Tydskrif vir Hedendaagse Romeins-Hollandse Reg (Journal of Contemporary Roman-Dutch Law) was borne with Idenburg in 1933, when he proposed the idea to the newly-established Afrikaans law faculty at the University of Pretoria and later Stellenbosch University, in South Africa.

Idenburg became a member of the journal's editorial board, along with professors Eduard Meijers, Julius Christiaan van Oven, LJ van Apeldoorn, J Donner, and the advocate FJ de Jong, who was the secretary of the board.

Peter Johannes was an elder brother of the statistician and director of Statistics Netherlands Prof. Dr. Philip Idenburg.