Sitia or Siteia is a port town and a municipality in Lasithi, Crete, Greece. The town has 11,166 inhabitants and the municipality has 20,438 (2021). It lies east of Agios Nikolaos and northeast of Ierapetra. Sitia's port is on the Sea of Crete, part of the Aegean Sea and is one of the economic centers of the Lasithi region. European route E75, which ends in Vardø, starts in Sitia. Sitia is served by the Sitia Public Airport. Sitia has not experienced the effects of mass tourism even though there is a long beach along the road leading to Vai and several places of historical interest.

Crete is the largest and most populous of the Greek islands, the 88th largest island in the world and the fifth largest island in the Mediterranean Sea, after Sicily, Sardinia, Cyprus, and Corsica. Crete rests about 160 km (99 mi) south of the Greek mainland, and about 100 km (62 mi) southwest of Anatolia. Crete has an area of 8,450 km2 (3,260 sq mi) and a coastline of 1,046 km (650 mi). It bounds the southern border of the Aegean Sea, with the Sea of Crete to the north and the Libyan Sea to the south. Crete covers 260 km from west to east but is narrow from north to south, spanning three longitudes but only half a latitude.