Islam is the third largest religion in Sri Lanka, with about 9.7 percent of the total population following the religion. About 1.9 million Sri Lankans adhere to Islam as per the Sri Lanka census of 2012. The majority of Muslims in Sri Lanka are concentrated in the Eastern Province of the island. Other areas containing significant Muslim minorities include the Western, Northwestern, North Central, Central and Sabaragamuwa provinces. Muslims form a large segment of the urban population of Sri Lanka and are mostly concentrated in major cities and large towns in Sri Lanka, like Colombo. Most Sri Lankan Muslims primarily speak Tamil, though it is not uncommon for Sri Lankan Muslims to be fluent in Sinhalese. The Sri Lankan Malays speak the Sri Lankan Malay creole language in addition to Sinhalese and Tamil.

The Eastern Province is one of the nine provinces of Sri Lanka, the first level administrative division of the country. The provinces have existed since the 19th century but did not have any legal status until 1987 when the 13th Amendment to the Constitution of Sri Lanka established provincial councils. Between 1988 and 2006 the province was temporarily merged with the Northern Province to form the North Eastern Province. The capital of the province is Trincomalee. Kalmunai is the largest and most populous city of Eastern Province.