Agios Nikolaos (Greek: Άγιος Νικόλαος, meaning Saint Nicholas) is a village located 110 kilometers south-east of Thessaloniki on the Chalkidiki peninsula in Macedonia, Greece.

In the plains east and south-east of the village agriculture predominates with olive trees as the main cultivated plant.

Toward the south, rises the Itamos mountain range of Sithonia and is completely covered with pine forest.

After the rise of tourism, some non-Greeks have settled permanently in Agios Nikolaos, for example, Germans, Dutch, and Austrians.

Inhabitants have built own hotels, homes, and pensions or sold-off their agricultural land for real estate purposes.

The ancient Greek city of Singos, which gave its name to the Singitic Gulf, was located within Agios Nikolaos' territory and dates back to 454 BCE.

It was probably near the Vourvourou bay on Livari peninsula, where an ancient wall of large stones is still visible (Mega Teichos).

No excavation was performed to confirm position and location of ancient Singos and significant remains of buildings are not evident.

The village's history dates back to the 14th century when inhabitants moved inland from the sea because of repeated attacks by pirates.

Agios Nikolaos fell under Ottoman Turkish rule from the 15th century until liberation in the Balkan Wars of 1912.

After the 1950s, peaceful times returned and the Agios Nikolaos area saw a tourism boom from the 1980s onwards which increased prosperity in the region.