Sitaro Islands Regency (Indonesian: Kabupaten Kepulauan Sitaro, although its formal name is Kabupaten Kepulauan Siau Tagulandang Biaro) is a regency located off the northern extremity of Sulawesi Island in the southern Sangihe Islands, North Sulawesi Province, Indonesia.

The regency was formed under Law Number 15 Year 2007 from 2 January 2007 (Indonesian: Undang-Undang Nomor 15 Tahun 2007), by separation from the Sangihe Islands Regency of which it had previously formed the southern part.

The main island is Siau, while further south (nearer Sulawesi) are Tagulandang and Biaro.

The religion of the majority of the population is Christianity and Catholicism, but there are also followers of Islam and Buddhism.

[1] The table also includes the locations of the district administrative centres, the number of administrative villages (totaling 83 rural desa and 10 urban kelurahan) in each district, and its postal codes.