Orahovica Monastery, Serbian Orthodox monastery in Duzluk near Orahovica, Croatia

Orahovica Monastery is a Serbian Orthodox monastery near Orahovica, Croatia, with multiple buildings arranged around the central Church of Saint Nicholas. Residential quarters occupy both the north and south sides, with some original frescoes from the 16th century partially surviving on the interior walls.

First documented in the 16th century, the monastery was listed as Remeta in the 1579 Ottoman census of the Požega Sanjak. After the Serbian Patriarchate was restored in 1557, it became the seat of the Požega Eparchy. Ottoman forces burned it during their retreat in the late 17th century, and monks from Lipje and Stuplje in Bosnia rebuilt it. Patriarch Arsenije III Čarnojević visited in 1693.

The monastery holds the relics of Saint Anastasia and a mitre that belonged to Bishop Vasilije Rajić, who died in 1714. Two annual assemblies draw pilgrims on 22 May, the transfer of Saint Nicholas's relics, and 19 August, the Transfiguration.

The monastery sits on the northern slopes of the Papuk and Krndija range, in the village of Duzluk near Orahovica. It has had no resident monks since the last two left in 1991, so the church and quarters are not always open. Two annual gatherings draw crowds on 22 May and 19 August.

The monastery's first written record is a 1579 Ottoman census of the Požega Sanjak, which lists it as Remeta, an old term for a hermitage. It was also sometimes called Duzluk after the nearby village. The name Orahovica later prevailed.