Pulau Muara Besar Bridge, Road bridge in Mukim Serasa, Brunei.

The Pulau Muara Besar Bridge is a dual-carriageway bridge running 2,680 metres from Serasa, in Mukim Serasa, across Brunei Bay to the southwest side of Pulau Muara Besar. It is 23 metres wide and was built by China Harbour Engineering Company, opening in May 2018.

Construction began in the mid-2010s and was finished a few years later to create a new crossing over the bay. This project represented a major step forward in connecting the island to the mainland infrastructure network.

The bridge takes its name from Pulau Muara Besar, the island it links to the mainland at Serasa. It was built to carry road and utility links to the island's petrochemical refinery project, a Chinese foreign direct investment, and access is limited to authorised project personnel.

The bridge is not open to public access as it connects to a private industrial facility on the island. You can view it from a distance, but crossing it is not permitted for general visitors.

The bridge was first conceived to link to a proposed 4-kilometre road running to an industrial site at the eastern end of Pulau Muara Besar, crossing Brunei Bay from the Serasa industrial park. A Korean–Brunei partnership won the consulting contract in August 2012 after an open procurement held in 2011.