Louise Elisabeth Maria Vet (born in Haarlem on 9 January 1954) is a Dutch biologist and emeritus professor of ecology at Wageningen University.

She then conducted research at the University of California and Leiden University, where she obtained her PhD in 1984 with her thesis Comparative ecology of hymenopterous parasitoids on the ecology and behavior of hymenopteran insects.

[2] In 1997 she became a professor at Wageningen University and Research and in 1999 was named director of the Netherlands Institute of Ecology (NIOO-KNAW), one of the largest institutes of the Royal Netherlands Academy of Arts and Sciences.

[3] Her research, both at NIOO and at Wageningen University, focuses on the ecology and evolution of plant-insect relationships, partly aimed at shaping sustainable agriculture - agro-ecosystems based on the prevention of diseases and plagues.

[4] She was very involved in the design of the new NIOO building, which has been called the most sustainable laboratory and office complex in the Netherlands.