Petar Popović (Serbian Cyrillic: Петар Поповић; 1826 – 29 August 1875), known as Pecija (Пеција), was a Serb hajduk (brigand) and rebel leader in two uprisings against the Ottoman Empire in the Bosanska Krajina region, one in 1858, and one in 1875.

Petar Popović was born into a Serbian Orthodox family in the village of Bušević, in Krupa na Uni (modern-day Bosnia and Herzegovina), in 1826.

On July 4, in the battle of Doljani near Bihać, some 100 Turks fell, after which Jeić crossed into Austria, trying to convince the Austrians that these peasants with pitchforks and scythes were worth more than to live off bread.

[2] At this time the Ottoman troops were strengthened with aiding detachments which were sent from all regions of Bosnia, and on July 21, the battle on Tavija near modern Kostajnica took place.

Pecija and Garača, weakened from the leaving of a larger number of rebels for the other side of the Una river (Austrian territory), did not have the strength to give serious resistance to the well-organized Ottoman army, so they decided to also flee to Austria.

[2] The next months, Pecija and Garača continued to fight a guerilla war over Knešpolje, however, the large-scale uprising had been crushed.

After Garača's death, Pecija decided to retreat into Austria, however, the Austrian government caught him in surprise and delivered him to the Ottomans for a prize of 5,000 groschen.

Pecija and his rebels managed to seize a boat and cross the river, but without protection, most of the men died from Ottoman gunfire.

A decade after his death, Pecija's remains were relocated and properly stored in the Moštanica monastery, at the foot of Kozara near Kozarska Dubica.

Serbs from Kozarska Dubica, among whom were Ostoja Kosanović, Jovo Subanović, Dimitrije Misaljević, started the initiative for the relocation of Pecija's remains to Bosnia in 1901, for a burial with dignity.