The Eastern Province, also known as the Eastern Region, is the easternmost of the 13 provinces of Saudi Arabia. It is the nation's largest province by area and the third most populous after the Riyadh and Mecca provinces. In 2017, the population was 4,900,325. Of these, 3,140,362 were Saudi citizens and 1,759,963 were foreign nationals The province accounts for 15.05% of the entire population of Saudi Arabia and is named for its geographical location relative to the rest of the kingdom.

Dammam is the capital of the Eastern Province of Saudi Arabia. With a population of 1,532,300 as of 2022, Dammam is the kingdom's fourth-most populous city after Riyadh, Jeddah, and Mecca. Dammam constitutes the core of the Dammam metropolitan area, also known as the Greater Dammam area, which comprises the 'Triplet Cities' of Dammam, Dhahran, and Khobar. The region is closely linked to the city through social, economic, and cultural ties. As of 2022, the Dammam metropolitan area's population was 2,190,900.