The Tammaro (Tàmmaro) is a river in southwestern Italy, with a length of 78 kilometres (48 mi) and catchment area of 673 square kilometres (260 sq mi). It rises in the Sella del Vinchiaturo in the Apennine Mountains and is a tributary of the Calore Irpino river. In ancient times it was known by the Latin name Tamarus.
Coordinates: 41°09′N 14°50′E / 41.150°N 14.833°E