Zerba is a village and comune (municipality) in the Province of Piacenza, in the Emilia-Romagna region of northern Italy. It is located about 170 kilometres (110 mi) west of Bologna, the regional capital, and about 50 kilometres (31 mi) southwest of Piacenza, the provincial capital.
The comune is very small, with a population of 66 inhabitants. It sits in the mountainous terrain of the Piacenza Apennines, near the border with Liguria and the province of Pavia.