San Pietro al Tanagro is a village and comune in the province of Salerno in the Campania region of south-west Italy.
San Pietro al Tanagro is 90 kilometers away from Salerno. It had a population of 1,644 inhabitants and a surface of 15,3 square kilometers thus showing a population density of 110/km^2. It rises 450 metres above sea level.
The municipality is bordered by Atena Lucana, Corleto Monforte, San Rufo, Sant'Arsenio and Teggiano.