The Borbera (Borbëa in Ligurian or Borbaja in Piedmontese) is a major torrente (a stream whose flow is marked by a high degree of seasonal variation) of the Province of Alessandria in the Italian region Piedmont.

It begins at an elevation of 1,700 metres (5,600 ft) on Monte Chiappo and runs a course of 38 kilometres (24 mi) before flowing into the Scrivia as its major right tributary at Vignole Borbera.

The river passes through the territories of the following communes: Cabella Ligure, Albera Ligure, Rocchetta Ligure, Cantalupo Ligure, Borghetto di Borbera, Vignole Borbera, Stazzano, Arquata Scrivia, Serravalle Scrivia.