Professor Adrianus Mattheus (Arjen) Dondorp (born September 1963) is a Dutch intensivist and head of the Mahidol-Oxford Tropical Medicine Research Unit in Bangkok, Thailand.
He has trained as an infectious diseases physician and has been living in Bangkok since 2000.
He is best known for his research in severe falciparum malaria, a disease that requires intensive care in hospital, an interest he developed following studies in rheology.
Dondorp highlights the significant importance of antimalarial drug resistance, particularly of artesunate, which have been used to treat malaria.
As a result, he chairs the World Health Organization Technical Expert Group on antimalarial medication drug resistance and Containment.