West Pasaman Regency (Indonesian: Kabupaten Pasaman Barat) is a regency (kabupaten) of West Sumatra, Indonesia. It has an area of 3,887.77 km, and it had a population of 365,129 at the 2010 Census and 431,672 at the 2020 Census; the official estimate as at mid 2023 was 450,050 - comprising 227,838 males and 222,232 females. The seat of the regency administration is the town of Simpang Ampek.

West Pasaman Regency is divided into eleven districts (kecamatan), tabulated below with their areas and their populations at the 2010 Census and the 2020 Census, together with the official estimates as at mid 2023. The table also includes the location of the district administrative centres, the number of administrative villages (nagari) in each district, and its post code.

Name of District (kecamatan)	Area in km	Pop'n Census 2010	Pop'n Census 2020	Pop'n Estimate mid 2023	Admin centre	No. of vill.	Post code
Sungai Beremas	440.48	22,345	27,556	29,080	Air Bangih	1	26573
Ranah Batahan	354.88	23,483	27,481	28,563	Silaping	2	26366
Koto Balingka	340.78	26,048	30,550	31,774	Parit	1	26572
Sungai Aur	420.16	30,846	36,031	37,430	Koto Dalam	1	26574
Lembah Melintang	263.77	41,924	49,289	51,299	Ujung Gading	1	26570
Gunung Tuleh	453.97	20,315	24,166	25,237	Simpang Tigo Alin	2	26571
Talamau	324.24	25,871	29,805	30,838	Talu	3	26561
Pasaman	508.93	62,864	77,102	81,240	Simpang Ampek	3	26566
Luhak Nan Duo	174.21	37,409	44,084	45,913	Sungai Talang	2	26568
Sasak Ranah Pasisie	123.71	13,233	14,946	15,375	Sasak	1	26367
Kinali	482.64	60,791	70,662	73,301	Kinali	2	26567
Totals	3,887.77	365,129	431,672	450,050	Simpang Ampek	19

Note: (a) includes 12 offshore islands.

Pusako Anak Nagari Airport is an airport that located in Luhak Nan Duo district, West Pasaman Regency

Talamau Peak (2,900 masl) can be accessed from Bundaran Simpang Ampek Pasaman vice versa in two or three days trip and located at Jorong Pinagar Nagari Aur Kuning, Pasaman District, West Pasaman Regency. Mount Talamau has more than 10 waterfalls and at around the peak there are also more than 10 lakes surrounding by many kinds of colourful flowers.

• Official website