Agop Terzan (born October 31, 1927) is a French-Armenian astronomer.
Born in Istanbul, he received his BA in Mathematical and Astronomical Science in 1945.
He received a master's degree in astronomy in 1949, and a PhD from Lyon University in 1965.He discovered 710 variable stars during the 1960s and 11 globular clusters, including Terzan 5 and Terzan 7 (both discovered in 1968).
Subsequently, he discovered 4430 new variable stars.
Terzan has also discovered 158 diffuse nebulae, 124 galaxies, and 1428 high proper motion stars.He is a member of the French National Astronomy Committee and the International Astronomical Union (IAU).