The Dark Horse Nebula or Great Dark Horse is a large dark nebula, which as seen from Earth, obscures part of the upper central bulge of the Milky Way. The Dark Horse lies in the equatorial constellation Ophiuchus, near its borders with the more famous constellations Scorpius and Sagittarius.

Constellation: Ophiuchus

Designations: Great Dark Horse

Right ascension: 17^h 21^m