Peter Elsbach (born 1924, Zeist) is a Dutch physician. He is an emeritus professor of medicine at the New York University School of Medicine. He is specialized in biochemistry, infectious diseases and natural anti-bacterial host defense.
In 1950 he obtained a degree in medicine from the University of Amsterdam. The next three years he was an intern at the local hospital. In 1953 he moved to the United States where he started residency training at the New York University School of Medicine. From 1956 to 1959 he did clinical fellowships at Rockefeller University. While at Rockefeller, he obtained his PhD in Medical Sciences from Leiden University in 1964 with his dissertation Uptake of Lipid by Phagocytic Cells. An Examination of the Role of Phagocytosis.
He was elected a corresponding member of the Royal Netherlands Academy of Arts and Sciences in 1979. He received an honorary degree from Lund University in 1993. In 2008 he received honorary life membership of the International Endotoxin and Innate Immunity Society. Elsbach is a member of the American Society for Clinical Investigation.