Jeremiah Paul Ostriker (b. 1937) is a distinguished astrophysicist at Princeton University. He received his Ph.D in 1964 at the University of Chicago. He has been very influential in advancing the theory that most of the mass in the universe is not visible at all, but consists of dark matter. Ostriker's research has also focused on the interstellar medium.

A selection of his recent publications includes:

• New Light on Dark Matter, Science, 300, pp 1909-1914 (2003)
• The Probability Distribution Function of Light in the Universe: Results from Hydrodynamic Simulations, Astrophysical Journal 597, 1 (2003)
• Cosmic Mach Number as a Function of Overdensity and Galaxy Age, Astrophysical Journal, 553, 513 (2001)
• Collisional Dark Matter and the Origin of Massive Black Holes, Physical Review Letters, 84, 5258-5260 (2000).
• Hydrodynamics of Accretion onto Black Holes, Adv. Space Res., 7, 951-960 (1998).

In 1972, Ostriker was awarded the Helen B. Warner Prize for Astronomy by the American Astronomical Society (AAS). In addition, the AAS also awarded him the Henry Norris Russell Lectureship in 1980. He received the Gold Medal of the Royal Astronomical Society in 2004.