Petar Nikolajević Moler (1775 – 1816) was a Serbian politician and revolutionary who served as prime minister of Serbia from 1815 to 1816.

[1] He was a nephew of Hadži-Ruvim, who was executed by the Dahije (renegade Janissaries) during the Slaughter of the knezes.

In the First Serbian Uprising, Moler distinguished himself in battle near the village of Jelenča.

[3] During the defense of Loznica in 1813, because of a lack of ink, Moler wrote a letter with his blood to the leaders of the uprising.

Moler and Bishop Melentije Simeonović Nikšić were among the first opposition leaders to Prince Miloš Obrenović, and as such were killed in 1816.