Michael Petrović-Njegoš of Montenegro (September 14, 1908, Podgorica - March 24, 1986, Paris) was the third (but eldest surviving) son of Prince Mirko Petrović-Njegoš, Grand Voivode of Grahovo and Zeta (1879-1918), and Natalija Konstantinović, a cousin of Aleksandar Obrenović of Serbia. He was pretender to the throne of Montenegro. He was the Grand Duke of Grahovo and Zeta, in succession to his father. King Nikola I Petrović-Njegoš of Montenegro was Michael's grandfather.

Michael was born the son of Prince Mirko of Montenegro in Cetinje in 1908. In 1916 he alongside the rest of the Royal Family and King Nikola fled to Italy as the patriotic defence of the country against Austria-Hungary collapsed. He attended a boarding school briefly in Naples before transferring to the seat of the Montenegrin Government in Exile in France and then joining his mother who had taken up residence in Eastbourne, England where he completed his primary education.

After his uncle Nikola died in 1921 the throne was inherited by Danilo. However, Danilo unexpectedly abdicated a few days later and on the advice of Queen Milena the throne was passed to the young Michael who to "reign" as King Mihaijlo I. In 1929 the Regency of General Anto Gvozdenovic ends and Mihaijlo - perhaps ill advisedly - renounces his dynasty's claim to the throne of Montenegro and declares allegience to the Kingdom of Serbs, Croats and Slovenes. The King of Serbia as thanks rewards Prince Mihaijlo with a pension from the Civil List.

In 1941 following the Fall of France, Prince Mihaijlo and his wife are arrested by the German occupation authorities. They are transferred to Germany and are held at a castle on the shores of Lake Constance. It is here that they are visited by Count Galeazzo Ciano and Joachim von Ribbentrop and are offered the throne of a new, independent Kingdom of Montenegro - but under German "protection" and "guidance". Bravely, he rejects this offer and remains imprisoned by the Germans until his aunt, the Queen of Italy, secures their release in 1943. He returns to France only to be arrested by the German authorities and transferred to a concentration camp in eastern Germany. It is in this camp that his son Prince Nicholas of Montenegro is born in 1944.

At the end of the war Michael, his wife and infant son are released and return to France taking up residence in Paris. Yugoslavia becomes a communist state in 1946 and the little money he received from the civil list is cut off. He remained in exile until his death in 1986. He is buried in the Serbian Orthodox Church cemetary in Paris.

Michael married Geneviève Prigent in Paris, France on January 27, 1941 and they divorced on August 11, 1949 in Paris. They had one child:

• Prince Nikola of Montenegro (July 7, 1944 - )

• Njegoševa Kapela Na Lovćenu Srpska Svetinja (Cyrillic: Нјегошева Капела На Ловћену Српска Светинја)

• The Njegoskij Fund Public Project : Biography of Prince Michel of Montenegro (1908-1986).
• The Njegoskij Fund Public Project : Biography of Genevieve Prigent, Militant Princess and French Resistant (1919-1990).