185 Eunike is a dark and very large Main belt asteroid. It has a primitive composition of carbonates.

It was discovered by C. H. F. Peters on March 1, 1878 and named after Eunike , a Nereid in Greek mythology whose name means 'happy victory'. The name was chosen to celebrate the Treaty of San Stefano (1878).

There have been three observed occultations of stars by Eunike.