Rokan Hilir ("Lower Rokan") is a regency (kabupaten) of Riau Province, on Sumatra island, Indonesia.

It was formed on 4 October 1999 from districts which had previously been the northwestern part of Bengkalis Regency.

[1] The administrative centre of the Rokan Hilir Regency is located at the town of Bagansiapiapi.

[1] The table also includes the locations of the district administrative centres, the number of administrative villages in each district (a total of 159 rural desa and 25 urban kelurahan), and its post code.

(f) the 2010 population of Kubu Babassalam District is included in the population figure for Kubu District, from which it was cut.