Dumai is a city in Riau province on the island of Sumatra, Indonesia. The city has an area of 2,039.35 km² and had 254,337 inhabitants at the 2010 Census. Dumai is an important transport and trade centre, both regionally and internationally, especially to Malaysia. Dumai is rich in oil (fuel and palm oil).
Dumai is divided in 7 subdistricts (kecamatan):
- Bukit Kapur
- Dumai Barat
- Dumai Timur
- Medang Kampai
- Sungai Sembilan
- Dumai Kota
- Dumai Selatan