190 Ismene is a very large main belt asteroid.

It was discovered by German-American astronomer C. H. F. Peters on September 22, 1878, in Clinton, New York, and named after Ismene, the sister of Antigone in Greek mythology.

Being a P-type asteroid, it has a very dark surface.

Ismene orbits near the outer edge of the asteroid belt.

It is one of the largest members of the Hilda asteroid family, which are locked in 3:2 resonance with the planet Jupiter.