Tanah Datar Regency

Tanah Datar Regency (Indonesian: Kabupaten Tanah Datar, lit.'Flat Land Regency'; pronounced) is a landlocked regency (kabupaten) in West Sumatra province, Indonesia. The regency has an area of 1,337.1 km and had a population of 338,484 at the 2010 Census, which rose to 371,704 at the 2020 Census. The official estimate as of mid 2025 was 392,740 (comprising 198,360 males and 194,380 females). The regency seat is the town of Batusangkar. The city of Padang Panjang is also geographically located within the regency but constitutes a municipality (kota otonom, meaning "autonomous city") of its own.

Tanah Datar has several tourist attractions including the Pagaruyung Palace (Istano Pagaruyuang) with its museum, Sanskrit and Malay language stone inscriptions from the 14th century, several sites with megaliths (batu tagak), and the village Pandai Sikat (Pandai Sikek), where the traditional songket (kain balapak) is woven. The northern part of Lake Singkarak is situated in Tanah Datar. The traditional bull race pacu jawi takes place in the regency, too.