Indragiri Hilir (or Lower Indragiri) is the most eastern regency () of Riau Province, Indonesia. It is located on the island of Sumatra. The regency has an area of 13,136.14 km<sup>2</sup> and had a population of 661,779 at the 2010 census and 654,909 at the 2020 Census; the official estimate as at mid 2024 was 729,147. The administrative centre of the regency is the town of Tembilahan.
The regency is divided into twenty districts (kecamatan), listed below with their areas and their populations at the 2010 census and the 2020 census, together with the official estimates as at mid 2024. The table also includes the locations of the district administrative centres, the number of administrative villages in each district (totaling 197 rural desa and 39 urban kelurahan), and its post code.
Note: (a) comprising the 8 kelurahan of Pekan Arba, Seberang Tembilahan, Sungai Beringin, Sungai Perak, Tembilahan Hilir, Tembilahan Kota, Seberang Tembilahan Barat and Seberang Tembilahan Selatan.
The only public airport in Indragiri Hilir is Tempuling Airport. There is also a private airport located in Pelangiran District owned by PT THIP.