Lago di Conza, reservoir in the province of Avellino, Campania, Italy

Lago di Conza is a reservoir in the Campania region of southern Italy, set in a valley between wooded hills. The water is bordered by flat shores where paths run along the edge, offering open views across the surface.

Lago di Conza was created in the 1970s, when a dam was built across the Ofanto river in the municipality of Conza della Campania, province of Avellino. The dam has operated on a trial basis since 1992, holding back a catchment of 252 km² and a useful capacity of 63 million m³. The reservoir was made for multiple uses, irrigation and, from 2013, drinking water.

The name Conza comes from the ancient settlement of Compsa, whose ruins lie close to the water's edge. Nearby villages still produce traditional ceramics and local cheeses that carry on crafts rooted in this part of Campania.

The lake is easiest to reach by car, with parking areas close to the shore. The paths along the water are flat and undemanding, so no special gear is needed for a walk around the edge.

The reservoir's dam has been in experimental operation since 1992, impounding 63 million cubic metres of usable water from a 252 km² catchment. Since 2013 the lake has also supplied drinking water, alongside irrigation. The basin lies within a wildlife protection oasis designated a Site of Community Importance.