Mirsarai Upazila is an Upazila under Chittagong District in the Division of Chittagong, Bangladesh. It is located at 22°46.3′ North and 91°34.5′ East. It is bounded by is Tripura, Chhagalnaiya and Feni Sadar on the north, Sitakunda and Sandwip on the south, Fatikchhari on the east, Sonagazi and Companiganj on the west. It is approximately 60 km away from Chittagong city.
Area: 482.88 sq. km
Population (around): 380,000
Population Density: 764 per sq. km
Total Unions: 16
Total Mouzas: 113
Literacy rate: 52.01%
Rivers: Feni and Muhuri (ফেনী নদী ও মুহুরী নদী)
Govt. Primary Schools: 145
Hat Bazaars: 34
Post Offices: 30
Govt. Hospital: 1; with 50 beds.
Canals: Isakhali, Hinguli, Moliaish, Koila Govania, Mahamaya, Domkhali, and Mayani Khal.