Brunei is a small sovereign state located on the northern coast of the island of Borneo in Southeast Asia. Islam was introduced to Brunei in the 15th century, and it became a fully Islamic state in the 16th century under the rule of Sultan Bolkiah. Since then, Islam has been deeply ingrained in Brunei's culture and way of life.

The sultanate of Brunei played a significant role in spreading Islam throughout the region during the 16th and 17th centuries, establishing trade networks and diplomatic relations with other Islamic states. Brunei's Islamic influence also extended to the southern Philippines, where the Sultanate of Sulu was established as a Muslim state.

Today, Brunei is known for its strong Islamic identity, and the country's legal system is based on Islamic law. The sultanate of Brunei continues to be an important center of Islamic learning, with several prominent Islamic scholars and institutions based in the country.