Martin Fredrik Seip (20 May 1921 – 6 May 2001) was a Norwegian physician.
He was the brother of politician Helge Seip.
He was appointed chief pediatrician at Rikshospitalet in 1968, and became a professor of medicine the same year.
He chaired the Norwegian Medical Association from 1966 to 1969.
This biographical article related to medicine in Norway is a stub.