Pekalongan Regency is a regency on the north coast of Central Java province in Indonesia. It covers an area of 836.13 km2 and had a population of 838,621 at the 2010 census and 968,821 at the 2020 census; the official estimate as at mid 2023 was 1,007,384. Its administrative centre was formerly at Pekalongan City, but since that city was administratively separated from the regency, the regency's capital is now at Kajen, which is located in the middle of the regency, about 25 km south of Pekalongan City. The regency was originally much larger, but on 14 June 1965 its eastern half was split off and formed into a separate Batang Regency. Pekalongan residents are well known for their pursuit of perfection regarding the Indonesian traditional clothing called Batik.

Central Java is a province of Indonesia, located in the middle of the island of Java. Its administrative capital is Semarang. It is bordered by West Java in the west, the Indian Ocean and the Special Region of Yogyakarta in the south, East Java in the east, and the Java Sea in the north. It has a total area of 33,750.37 km2, with a population of 36,516,035 at the 2020 Census making it the third-most populous province in both Java and Indonesia after West Java and East Java. The official population estimate in mid-2023 was 37,608,336 The province also includes a number of offshore islands, including the island of Nusakambangan in the south, and the Karimun Jawa Islands in the Java Sea.