Kuantan Singingi is a regency (kabupaten) of Riau, Indonesia. It is located on the island of Sumatra. The regency was created on 4 October 1999 from what had been the western half of Indragiri Hulu Regency. It has an area of 7,656.03 km² and had a population of 292,116 at the 2010 Census^[2] and 334,943 at the 2020 Census;^[3] the official estimate as at mid 2022 was 345,850 (comprising 175,645 males and 170,205 females).^[1] The seat of the regency is the town of Teluk Kuantan.

At the time of the 2010 Census, the regency was divided into twelve districts (kecamatan), but three additional districts (Pucuk Rantau, Sentajo Raya and Kuantan Hilir Seberang) have subsequently been created by the division of existing districts. They are all listed below with their areas and their populations at the 2010 Census,^[2] and the 2020 Census.^[3] together with the official estimates as at mid 2022.^[1] The table also includes the locations of the district administrative centres, the number of administrative villages in each district (totaling 218 rural desa and 11 urban kelurahan), and its post code.

Notes: (a) including 1 kelurahan. (b) the 2010 populations of these three new districts are included in the figures for the districts from which they were cut out.
(c) including 3 kelurahan. (d) including 2 kelurahan.

The most attractive tourist event is the Pacu Jalur which is held in every August annually. The Pacu Jalur is a kind of boat race.