Rokan Hulu is a regency (kabupaten) of Riau, Indonesia. It is located on the island of Sumatra. Rokan Hulu Regency was created on 4 October 1999 as a result of the division of Kampar Regency, of which it was previously the western 24%. The new Regency was established under Law No. 53 of 1999 and Law No. 11 of 2003 on changes to Law Decree No. 53 of 1999, which is reinforced by the Constitutional Court Decision No. 010 / PUU-1/2004, dated 26 August 2004. It mainly occupies the upper part of the catchment area of the Rokan River, and has an area of 7,588.13 km². It had 474,843 inhabitants at the 2010 Census and 561,385 at the 2020 Census; the official estimate as at mid 2022 was 582,679. The administrative centre of the regency is located at Pasir Pengaraian.

Kampar is a regency (kabupaten) of Riau Province of Indonesia. The regency formerly included a much larger part of Riau Province, but on 4 October 1999 the western districts were split off to form a separate Rokan Hulu Regency, and the eastern districts were split off to form a new Pelalawan Regency. It now has an area of 11,289.28 km2 and had a population of 688,204 at the 2010 Census, and 841,332 at the 2020 Census; the official estimate as at mid 2022 was 878,210. The administrative centre of the regency is located at Bangkinang town.