16 June] 1895 – 21 October 1916) was a Bosnian Serb member of the Black Hand organization which was involved in the assassination of Archduke Franz Ferdinand.

When it was announced that Archduke Franz Ferdinand, the heir to the throne of Austro-Hungarian Empire, was going to visit Bosnia and Herzegovina in June 1914, Colonel Dragutin Dimitrijević, the chief of the Intelligence Department in the Serbian Army and head of the Black Hand, sent seven men, Grabež, Nedeljko Čabrinović, Vaso Čubrilović, Cvjetko Popović, Danilo Ilić, Muhamed Mehmedbašić and Gavrilo Princip to Sarajevo to assassinate him.

[citation needed] Nikola Pašić, the prime minister of Serbia, heard about the plot and gave instructions for Grabež, Princip and Čabrinović to be arrested when they attempted to leave the country.

However, his orders were not implemented and they managed to reach Bosnia and Herzegovina where they joined forces with fellow conspirators, Vaso and Veljko Čubrilović, Muhamed Mehmedbašić, Danilo Ilić and Cvijetko Popović.

General Oskar Potiorek, Governor of the Austrian provinces of Bosnia and Herzegovina, was waiting to take the royal party to the City Hall for the official reception.

They were spaced out along the Appel Quay, each one had been instructed to try to kill Franz Ferdinand when the royal car reached his position.

Later that day, Gavrilo Princip managed to kill both Archduke Franz Ferdinand and his wife Sophie, Duchess of Hohenberg.

Muhamed Mehmedbašić managed to escape to Serbia but Grabež, Popović and the Čubrilović's were arrested and charged with treason and murder after Danilo Ilić told the police.