Muhamed Mehmedbašić (1887 – 29 May 1943) was a Bosnian revolutionary and the main planner in the assassination of Archduke Franz Ferdinand, which led to a sequence of events that resulted in the outbreak of World War I. Mehmedbašić was born in 1887 into a Bosnian family in Stolac, in the region of Herzegovina (at the time part of Austro-Hungarian Bosnia and Herzegovina).

[3] While working as a carpenter, Mehmedbašić befriended Black Hand member Danilo Ilić, the main organizer of conspiracy against the Austro-Hungarian rule in Bosnia and Herzegovina.

Black Hand founding member Vojislav Tankosić led a Chetnik detachment, in which many revolutionaries volunteered (including Golubić).

In late 1913, Danilo Ilić recommended the end of revolutionary organization building and a move to direct action against Austria-Hungary when meeting a Serbian captain and fellow Black Hand member in Užice.

Ilić then met with Chief of Serbian Military Intelligence Colonel Dragutin Dimitrijević "Apis", the leader of the Black Hand, to discuss the matter.

[11] Apis and fellow conspirators Milan Ciganović and Major Tankosić hired three youngsters, Gavrilo Princip, Nedeljko Čabrinović and Trifko Grabež to carry out the assassination.

[16] Gavrilo Princip stayed in Sarajevo with Danilo Ilić, who hired three more as a backup team, Vaso Čubrilović, Cvjetko Popović and Mehmedbašić.

[18][contradictory] The motorcade made it safely to the Hall, and speeches were held, in which Franz Ferdinand was concerned about the injured and insisted on visiting them at the hospital, advised against by von Morsey but supported by Potiorek.

[18][contradictory] As the motorcade took a wrong route to the hospital, it found itself outside the café where Princip was at; he fired fatal shots at the royal couple and then turned the gun at himself, however, two bystanders stopped him and he was arrested.

[23] In Serbia, Mehmedbašić met up with Mustafa Golubić, with whom he joined the Chetnik detachment of Vojislav Tankosić that fought in World War I.

On 15 March 1917 Apis and the officers loyal to him were indicted, on various false charges by Serbian Court Martial on the French-controlled Salonika front (known in Serbo-Croatian as Solunski proces).

[28] During the trial, Mehmedbašić said that "I saw in Serbia with my eyes as the Piedmont of Serbdom, I couldn't see anything else..." and that his idol was "the national guslar (poet) singing Serbian songs".

[32] He was buried in the cemetery of the town of Ilidža, in the Butmir municipality, located on a side of the present-day Sarajevo Airport, in the outskirts of the city.