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Rembang Regency is a regency on the extreme northeast coast of Central Java Province, on the island of Java (bordering on the Java Sea) in Indonesia. The regency covers an area of 1,036.70 km2 on Java, and it had a population of 591,359 at the 2010 Census and 645,333 at the 2020 Census; the official estimate as of mid 2025 was 670,095 (of whom 336,601 were males and 333,494 were females). Its administrative capital is the town of Rembang.

Java Sea coast in Rembang Regency. Shoreline with mangrove forest.

It is a lowland, with a maximum elevation of about above sea level.

The Solo River flows through its inland section.

The regency is crossed by the North Coast Road, an inter-province main road on the island.

Rembang Regency is bordered by: North: Java Sea East: Tuban Regency in East Java Province South: Blora Regency West: Pati Regency

Dutch East Indies colonial church in Lasem (Rembang).

Rembang has a tropical monsoon climate (Am) with moderate to little rainfall from May to October and heavy rainfall from November to April.