West Aceh Regency

West Aceh Regency () is a regency in the Aceh special region of Indonesia. It is located on the island of Sumatra. The regency formerly covered a much larger area, but on 4 October 1999 the districts on the island of Simeulue were separated out to form their own regency, and on 10 April 2002 two additional regencies - Aceh Jaya and Nagan Raya - were created from parts of West Aceh; the residual regency currently covers an area of 2,927.95 square kilometres and had a population of 173,558 at the 2010 Census and 198,736 at the 2020 Census; the official estimate as of mid 2024 was 209,220 (comprising 105,470 males and 103,750 females).

The town of Meulaboh remains the seat of the regency government (notwithstanding incorrect reports that on 8 July 2013 it was separated out as an independent city). The regency is a palm oil-producing area. While the majority of the population are Acehnese people, some of the people of the regency are Minangkabau-descended Aneuk Jamee.

The regency was among the hardest-hit areas during the 2004 Indian Ocean earthquake.

The regency is bordered by the regencies of Aceh Jaya to the west, Pidie to the north, Central Aceh to the northeast, and Nagan Raya to the southeast, and by the Indian Ocean to the southwest.