The Cârțișoara (Hungarian: Kerci-patak) is a left tributary of the river Olt in Romania. The source of the Cârțișoara is near Bâlea Lake in the Făgăraș Mountains. It discharges into the Olt in Cârța. Its length is 24 km (15 mi) and its basin size is 79 km (31 sq mi).