Mong Chau () was an island off South Kwai Chung, in the Rambler Channel, Hong Kong. The island was incorporated in the reclamation for the Chung Container Port (present-day Kwai Tsing Container Terminals). It was located between what is now Container Terminals 3 and 4.

Also known as Ballast Island, Mong Chau had a fort and customs station.

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