Ad van der Avoird (born 19 April 1943) is a Dutch theoretical chemist.
[1] He studied at Eindhoven University of Technology, obtaining his PhD under George Schuit in 1968 with a thesis titled: "Perturbation theory for intermolecular forces : application to some adsorption models".
[3] In 2013 Van der Avoird provided a theory on the relation between two benzene rings and their possible motion, the discovery was published with Gerard Meijer and a German research team in a paper in Angewandte Chemie.
[6] On 25 April 2014 he was made a Knight in the Order of the Netherlands Lion, one of only fifteen appointees that year.
[6] Van der Avoird became member of the Royal Netherlands Academy of Arts and Sciences in 1979.