Mirko Petrović-Njegoš (Serbian Cyrillic: Мирко Петровић-Његош; 19 August 1820 – 1 August 1867) was a Montenegrin military commander, politician and poet, belonging to the House of Petrović-Njegoš. He was given the title of Grand Duke of Grahovo (Veliki vojvoda od Grahova), and is thus also known as Duke Mirko (Vojvoda Mirko). He was the father of Nikola, the future ruler of Montenegro.