Countess Júlia Hunyady de Kéthely (Serbian: Јулија Хуњади де Кетељ; 26 August 1831 – 19 February 1919) was a Hungarian noblewoman and the Princess consort of Serbia as the wife of Prince Mihailo Obrenović III.

On 26 September 1860, after the death of his father, Miloš Obrenović, Mihailo once again assumed power as the ruler of Serbia, making Júlia the Princess consort.

It was Velimir who had a more close relationship with Júlia and visited her more often than his own father Mihailo, with whom he spent time only in the evening, playing billiards in the basement of the Old Palace.

The same year Mihailo was assassinated, Katarina married General Milivoje Blaznavac and later assumed the role of first lady at her cousin King Milan's court, when the latter's wife, Queen Natalie, separated from him to live abroad.

Júlia continued her love affair with Duke Karl, finally marrying him on 16 January 1876 at Ivanka pri Dunaji, which her first father in law Prince Miloš acquired for her and Mihailo as their wedding present from the widowed Princess Leopoldine Grassalkovich de Gyarak, born Countess Esterhazy (1776–1864).