Aceh Singkil Regency is a regency (Indonesian: kabupaten) in the Aceh province of Indonesia. It is situated largely on the island of Sumatra, but also includes the offshore Banyak Islands, the largest of which is Tuangku (Great Banyak), with the principal town of Alaban. The seat of the regency government is at Singkil on the Sumatra coast.
"Banyak" means "many" because there are 99 islands, of which only a few are inhabited. Yachts from Nias Island or directly from abroad carries foreign tourists to Big Palambak Island or Small Palambak Island to take fresh water and snorkelling. Tailena Island, Rago-rago Island, Panjang (Long) Island and Matahari (Sun) Island are also suitable for scuba diving, while in Tuwanku (My Master) Island a conservation of Penyu Hijau (Chelonia Mydas) and Penyu Belimbing (Dermochelys coriacea) is established.