Rembang Regency is a regency on the extreme northeast coast of Central Java Province, on the island of Java 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-2023 was 660,166, of whom 331,870 were males and 328,296 were females. Its administrative capital is the town of Rembang.