Sibungor Island (Malay: Pulau Sibungor) is a small islet situated on the Brunei River in the Brunei–Muara District, southwest of Bandar Seri Begawan. This uninhabited island not only plays a critical ecological role as part of the Brunei River's mangrove ecosystem but also serves as an important navigational landmark, aiding vessels traversing the river.

Sibungor Island, an 8-hectare (20-acre) island southwest of Bandar Seri Begawan, is uninhabited and serves as a vital habitat for the endangered proboscis monkey. Sharing similar features with nearby islands like Pulau Lumut Lunting, which spans just 1 hectare, Sibungor Island is surrounded by marshes fringed with Rhizophora apiculata mangroves. These islands play a crucial role in the Brunei River's rich mangrove ecosystem, providing essential breeding and nursery grounds for various aquatic organisms. Additionally, Sibungor Island serves as an important navigational landmark. Located approximately 5 miles (8.0 km) southwest of river point at the confluence of the Brunei River and Butir River, it requires careful navigation due to tidal whirls and eddies. Vessels must pass west of the two beacons near the island and proceed with caution.

On 8 April 1958, M.S.T. M.L. Eager and the Sarawak government launch Apoh collided in the entrance to Brunei Town, close to Sibungor Island. The Apoh was hit amidships on the port side and suffered serious damage above the waterline. Neither passengers nor crew suffered any injuries or lost their lives.

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  Mangroves on the island
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  The former feeling station on the island
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  The island in 2011
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  The island seen from a commercial aircraft in 2023

• List of islands of Brunei

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