Tegal Regency is one of the regencies in the northwest part of Central Java province of Indonesia, with an area of 983.9 km2 (379.9 sq mi). The administrative center used to be in Tegal City, in the northwest corner of the regency, but then Tegal City was administratively separated from the regency and formed into its own territory. The city was later replaced as the administrative center of Tegal Regency by Slawi Town, which is a suburb about 20 km (12 mi) to the south of the city and within the district boundary. The regency had a population of 1,394,839 at the 2010 Census and 1,596,996 at the 2020 Census; the official estimate as at mid 2023 was 1,654,836.

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.