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.

Riau is a province of Indonesia. It is located on the central eastern coast of Sumatra along the Strait of Malacca. The province shares land borders with North Sumatra to the northwest, West Sumatra to the west, and Jambi to the south, and a maritime border with the Riau Islands and the country of Malaysia to the east. It is the second-largest province in the island of Sumatra after South Sumatra, and is slightly larger than Jordan. According to the 2020 census, Riau had a population of 6,394,087 across a land area of 89,935.90 km²; the official estimate of population as of mid-2022 was 6,614,384. The province comprises ten regencies and two cities, with Pekanbaru serving as the capital and largest city.