Dan Olweus (April 18, 1931 – September 2020) was a Swedish-Norwegian psychologist. He was a research professor of psychology at the University of Bergen, Norway. Olweus was known as a pioneer of research on bullying. He was born in Nässjö, Sweden.
He was elected a member of the Academia Europaea in 1990.
Olweus died in September 2020 at the age of 89.