Delta () is a municipality in the Thessaloniki regional unit of Central Macedonia, Greece. The seat of the municipality is the town of Sindos. It covers an area of 311.09 km<sup>2</sup>.
The municipality Delta was formed at the 2011 local government reform by the merger of the following 3 former municipalities, that became municipal units:
It took its name from the Delta (estuary) of Axios river.