89 Julia is a large main belt asteroid. It is likely composed of silicate rock and nickel-iron metals.
It was discovered by a French astronomer Édouard Stephan on August 6, 1866. It was first of his two asteroid discoveries; the other was 91 Aegina. It believed to be named after Saint Julia of Corsica.
A stellar occultation by Julia was observed on December 20, 1985.