Princess Ljubica Petrović-Njegoš of Montenegro (Serbian: Љубица Петровић-Његош; 23 December 1864 – 16 March 1890), later Princess Zorka Karađorđević in Serbia. She was better known as Princess Zorka.

She was the eldest child of the Montenegrin monarch Nicholas I and Milena Vukotić, and the wife of Peter Karađorđević (who would become King of Serbia in 1903, long after her death).

Born in Cetinje, Montenegro at the time when her father was already the reigning Prince of Montenegro (his uncle Danilo II Petrović-Njegoš having died in 1860). Zorka was educated in Russia before returning to Montenegro to be engaged to Karađorđević. Zorka's sister Elena married the future King Victor Emmanuel III of Italy.

Described as "exuberant" by one commentator, Zorka married Peter in Cetinje on 1 August 1883 in a Serbian Orthodox ceremony.

They had five children:

Zorka died aged just 25 on 16 March 1890 in Cetinje during childbirth and was buried in the St. George's Church in Topola, Serbia.

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