Spaccanapoli is the straight and narrow main street that traverses the old, historic center of the city of Naples, Italy.

The name is a popular usage and means, literally, "Naples splitter".

The name is derived from the fact that it is very long and from above it seems to divide that part of the city.

The three decumani were (and still are) intersected by numerous north-south cross-streets called cardini, together forming the grid of the ancient city.

Spaccanapoli is the main promenade for tourists as it provides access to a number of important sights of the city.