Mrduja is an uninhabited island in the Croatian region of Dalmatia. It is located in the Adriatic Sea, within the Split Gates between the islands of Braàand à  olta, about 400 m from Cape Zaglav near Milna. The island is nearer to Braàthan to à  olta: a legend goes that the inhabitants of Braàand those of à  olta wrangled over whom the island belonged to so they used a rope in an attempt to pull it from one side of the Split Channel to the other. The people of Braàwon the tug of war.
A lighthouse (CRO 099), the ruins of old fortification, and several pines, agaves and opuntias grace the islet, which is the turning point for the Mrduja Regatta.