San Costantino Calabro is a comune located in the Province of Vibo Valentia within the Calabria region of southern Italy. It is situated approximately 50 kilometres southwest of Catanzaro and about 4 kilometres southwest of the city of Vibo Valentia.
As of December 31, 2004, the municipality encompassed an area of 7.0 square kilometres and had a recorded population of 2,320 residents.