Rokan Hilir Regency
Rokan Hilir ("Lower Rokan") is a regency (kabupaten) of Riau Province, on Sumatra island, Indonesia. It occupies the lower part of the catchment area of the Rokan River, and has an area of 8,851.59 km². It had a population of 553,216 at the 2010 Census; the latest official estimate (as at January 2014) was 635,151. The administrative centre of the Rokan Hilir Regency is located at Bagansiapiapi.

Administrative districts 
The regency is divided into 13 districts (kecamatan), listed below:

 Bangko
 Sinaboi
 Rimba Melintang
 Bangko Pusako
 Tanah Putih Tanjung Melawan
 Tanah Putih
 Kubu
 Bagan Simembah
 Pujud
 Simpang Kanan
 Pasir Limau Kapas
 Batu Hampar
 Rantau Kopar

Towns with significant populations 

 Bagansiapiapi
 Bagan Batu
 Panipahan
 Ujung Tanjung
 Pulau Halang