Mempawah Regency (formerly called the Pontianak Regency) is a regency of West Kalimantan Province of Indonesia. Originally including a wider area of West Kalimantan, this Pontianak Regency was reduced on 4 October 1999 by the north-eastern districts (formerly the majority of the regency's land area) being removed to form a new Landak Regency, and was further reduced on 17 July 2007 by its southern districts cut out to create a new Kubu Raya Regency. Since 2007 the residual regency (now renamed Mempawah Regency) covers 1,935.42 km, and had a population of 234,021 at the 2010 Census and 301,560 at the 2020 Census; the official estimate as at mid 2023 was 312,785 (comprising 159,986 males and 152,799 females). The administrative centre is at the town of Mempawah.

On 5 February 1963, the administrative centre of Pontianak Regency was moved from Pontianak to Mempawah based on Minister of General Government and Regional Autonomy Decree No. Des.52/1/9-11 (Surat Keputusan Menteri Pemerintahan Umum Otonomi Daerah Nomor Des.52/1/9-11).

Based on Government Regulation No. 58 of 2014 (Peraturan Pemerintah Nomor 58 Tahun 2014), Pontianak Regency was formally renamed Mempawah Regency after the name of its administrative centre.

When Pontianak Regency was originally created, it consists into the districts of Sungai Kunyit, Mempawah Hilir, Sungai Pinyuh, Toho, Siantan, Mandor, Menjalin, Mempawah Hulu, Menyuke, Sengah Temila, Air Besar, Ngabang, Sungai Raya, Sungai Kakap, Kubu, Terentang, Teluk Pakedai and Batu Ampar. On 1 April 1961, a new district named Sungai Ambawang was established from the northern part of Sungai Raya district. On 17 June 1996, Meranti district was established by split off from the northeastern part of Menyuke district. On 25 March 1999, three new districts were established (Kuala Mandor B was cut out from the northern part of Sungai Ambawang district, Kuala Behe and Sebangki districts were cut out from the southern parts of Air Besar and Sengah Temila districts, respectively). When Landak Regency was established in the same year, the north-eastern districts (including Kuala Behe and Sebangki, which were established few months earlier) were became part of the newly-created regency.

In 2001, a new district named Rasau Jaya was established from the eastern part of Sungai Kakap district. In 2005, two new districts were established (Segedong district was split off from the northern part of Siantan district and Anjongan district was split off from the north-eastern part of Sungai Pinyuh district). The following year, another two districts were created (Sadaniang district was cut out from the western part Toho and Mempawah Timur was cut out from the eastern part of Mempawah Hilir).

Since the separation of the southern parts of the former Pontianak Regency on 17 July 2007 to form the new Kubu Raya Regency, the residual area - in 2014 renamed as Mempawah Regency - consists of nine 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 locations of the district administrative centres, the number of administrative villages in each district (a total of 60 rural desa and 7 urban kelurahan), and its post code.

Kode Wilayah	Name of District (kecamatan)	Year formed	Area in km	Pop'n Census 2010	Pop'n Census 2020	Pop'n Estimate mid 2023	Admin centre	No. of villages	Post code
61.02.08	Siantan (Jongkat)	—	290.93	40,360	50,275	51,629	Jungkat	5	78352
61.02.15	Segedong	2007 (from Siantan)	273.45	20,249	26,149	27,136	Parit Bugis	6	78351
61.02.07	Sungai Pinyuh (Pinyuh River)	—	171.11	47,311	61,352	63,742	Sungai Pinyuh	9	78354
61.02.16	Anjongan	2005 (from Sungai Pinyuh)	124.28	16,628	20,878	21,490	Anjungan Melancar	5	78353
61.02.01	Mempawah Hilir (Lower Mempawah)	—	154.73	34,328	44,936	46,816	Terusan	8	78911 -78919
61.02.18	Mempawah Timur (East Mempawah)	2006 (from Mempawah Hilir)	120.39	25,220	33,761	35,403	Antibar	8	78915 & 78919
61.02.12	Sungai Kunyit (Kunyit River)	—	129.23	22,069	28,380	29,415	Sungai Kunyit Laut	12	78371
61.02.06	Toho	—	226.01	17,724	23,613	24,727	Pak Laheng	8	78360
61.02.17	Sadaniang	2006 (from Toho)	445.30	10,132	12,216	12,427	Pentek	6	78361
	Totals		1,935.42	234,012	301,560	312,785	Mempawah	67

Notes: (a) including the kelurahan of Sungai Pinyuh. (b) including the kelurahan of Anjungan Melancar.
(c) including the 3 kelurahan of TYerusan, Tanjung and Tengah. (d) including the 2 kelurahan of Pasir Wan Salim and Pulau Pedalaman.

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  Emblem of the former Pontianak Regency (1963-2014). To prevent confusion with Pontianak City and the creation of Landak Regency and Kubu Raya Regency from its territory, the residual part of this regency was in 2014 renamed as Mempawah Regency.

0°15′00″N 109°10′00″E / 0.2500°N 109.1667°E / 0.2500; 109.1667