Einar Nilson Gjerstad (30 October 1897, Örebro – 8 January 1988, Lund) was a Swedish archaeologist of the ancient Mediterranean, particularly known for his work on Cyprus, as well as his studies of early Rome.From 1927 until 1931 Gjerstad carried out excavations on Cyprus.
From 1935 until 1940, Gjerstad served as director the Swedish Institute at Rome.
When Gjerstad left Rome in 1940, he assumed the position of Professor of Classical Archaeology and Ancient History at Lund University.He was a pioneer in the study of Cypriot Bichrome ware.