Adriaan "Aad" van Wijngaarden (2 November 1916 – 7 February 1987) was a Dutch mathematician and computer scientist.

He joined the Nationaal Luchtvaartlaboratorium in 1945 and went with a group to England the next year to learn about new technologies that had been developed there during World War II.

[1] He then made further visits to England and the United States, gathering ideas for the construction of the first Dutch computer, the ARRA, an electromechanical device first demonstrated in 1952.

in 1958, while visiting Edinburgh, Scotland, Van Wijngaarden was seriously injured in an automobile accident in which his wife was killed.

In 1962, he became involved with developing international standards in programming and informatics, as a member of the International Federation for Information Processing (IFIP) IFIP Working Group 2.1 on Algorithmic Languages and Calculi,[4] which specified, maintains, and supports the programming languages ALGOL 60 and ALGOL 68.