Sistan and Baluchestan province (Persian: استان سيستان و بلوچستان) is the second largest of the 31 Provinces of Iran, after Kerman Province, with an area of 180,726 km. Its capital is the city of Zahedan. The province is in the southeast of the country, bordering Afghanistan and Pakistan.

In the inscriptions at Behistun and Persepolis, Sistan is mentioned as one of the eastern territories of Darius the Great. The name Sistan, as mentioned above, is derived from Saka (also sometimes Saga, or Sagastan), a Central Asian tribe that had taken control over this area in the year 128 BC. During the Arsacid dynasty (248 BC to 224 AD), the province became the seat of Suren-Pahlav Clan. From the Sassanid period until the early Islamic period, Sistan flourished considerably.

During the reign of Ardashir I of Persia, Sistan came under the jurisdiction of the Sassanids, and in 644 AD, the Arab Muslims gained control as the Persian empire was in its final moments of collapsing.

During the reign of the second Sunni caliph, Omar ibn Al-Khattab, this territory was conquered by the Arabs and an Arab commander was assigned as governor. The famous Persian ruler Ya'qub-i Laith Saffari, whose descendants dominated this area for many centuries, later became governor of this province. In 916 AD, Baluchestan was ruled by the Daylamids and thereafter the Seljuqids, when it became a part of Kerman. Dynasties such as the Saffarids, Samanids, Qaznavids, and Seljuqids, also ruled over this territory.

In 1508 AD, Shah Ismail I of the Safavid dynasty conquered Sistan. After the assassination of Nader Shah in 1747, Sistan and Balochistan became part of the Brahui Khanate of Kalat, which ruled it till 1896. Afterwards, it became part of Qajar Iran.

The Baloch form a majority 90% of the population and the Persian Sistani a minority. Smaller communities of Kurds (in the eastern highlands and near Iranshahr); the expatriate Brahui (along the border with Pakistan); and other resident and itinerant ethnic groups, such as the Romani, are also found within the province.

Most of the population are Balōch and speak the Baluchi language, although there also exists among them a small community of speakers of the Indo-Aryan language Jadgali. Baluchestan means "Land of the Balōch"; Sistani are the second largest ethnic group in this province who speak the Sistani dialect of Persian.

The minority Sistani people of Sistan and Baluchestan province are Shia Muslims, and the majority Baloch people of the Baluchestan area in the province are Sunni Muslims, specially Deobandis.

At the time of the 2006 National Census, the province's population was 2,349,049 in 468,025 households. The following census in 2011 counted 2,534,327 inhabitants living in 587,921 households. The 2016 census measured the population of the province as 2,775,014 in 704,888 households.

The population history and structural changes of Sistan and Baluchestan Province's administrative divisions over three consecutive censuses are shown in the following table.

Sistan and Baluchestan Province

Counties	2006	2011	2016
Bampur	—	—	—
Chabahar	214,017	264,051	283,204
Dalgan	—	62,813	67,857
Dashtiari	—	—	—
Fanuj	—	—	49,161
Golshan	—	—	—
Hamun	—	—	41,017
Hirmand	—	65,471	63,979
Iranshahr	264,226	219,796	254,314
Khash	161,918	155,652	173,821
Konarak	68,605	82,001	98,212
Lashar	—	—	—
Mehrestan	—	62,756	70,579
Mirjaveh	—	—	45,357
Nik Shahr	185,355	212,963	141,894
Nimruz	—	—	48,471
Qasr-e Qand	—	—	61,076
Rask	—	—	—
Saravan	239,950	175,728	191,661
Sarbaz	162,960	164,557	186,165
Sib and Suran	—	73,189	85,095
Taftan	—	—	—
Zabol	317,357	259,356	165,666
Zahedan	663,822	660,575	672,589
Zarabad	—	—	—
Zehak	70,839	75,419	74,896
Total	2,349,049	2,534,327	2,775,014

According to the 2016 census, 1,345,642 people (over 48% of the population of Sistan and Baluchestan Province) live in the following cities:

City	Population
Adimi	3,613
Ali Akbar	4,779
Bampur	12,217
Bazman	5,192
Bent	5,822
Bonjar	3,760
Chabahar	106,739
Dust Mohammad	6,621
Espakeh	4,719
Fanuj	13,070
Galmurti	10,292
Gosht	4,992
Hiduj	1,674
Iranshahr	113,750
Jaleq	18,098
Khash	56,584
Konarak	43,258
Mehrestan	12,245
Mirjaveh	9,359
Mohammadabad	3,468
Mohammadan	10,302
Mohammadi	5,606
Negur	5,670
Nik Shahr	17,732
Nosratabad	5,238
Nukabad	5,261
Pishin	16,011
Qasr-e Qand	11,605
Rask	10,115
Saravan	60,014
Sarbaz	2,020
Sirkan	2,196
Suran	13,580
Zabol	134,950
Zahedan	587,730
Zarabad	4,003
Zehak	13,357

The following table shows the ten largest cities of Sistan and Baluchestan province:

Rank	Name	Population (2016)
1	Zahedan	587,730
2	Zabol	134,950
3	Iranshahr	113,750
4	Chabahar	106,739
5	Saravan	60,014
6	Khash	56,584
7	Konarak	43,258
8	Jaleq	18,098
9	Nik Shahr	17,732
10	Pishin	16,011

The whole of the province had been previously called Baluchestan, but the government added Sistan to the end of Baluchestan. After the 1979 revolution, the name of the province was changed to Sistan and Baluchestan.

Today, Sistan refers to the area comrising Zabol, Hamun, Hirmand, Zehak and Nimruz counties. The province borders South Khorasan Province in the north, Kerman Province and Hormozgan Province in the west, the Gulf of Oman in the south, and Afghanistan and Pakistan in the east.

Sistan and Baluchestan Province is one of the driest regions of Iran, with a slight increase in rainfall from east to west, and a rise in humidity in the coastal regions. The province is subject to seasonal winds from different directions, the most important of which are the 120-day wind of Sistan, known in Baluchi as Levar; the seventh wind (Gav-kosh); the south wind (Nambi); the Hooshak wind; the humid and seasonal winds of the Indian Ocean; the north wind (Gurich); and the western wind (Gard).

In 2023, Sistan region was affected by several dust events, occurring in April, June, and August. The latter sent 1120 people to hospitals from 10 to 14 August. Winds reached a speed of 108 km/h (67 mph) in Zabol station and reduced visibility to 600 m (2,000 ft).

Sistan and Baluchestan is the poorest of Iran's 31 provinces, with a HDI score of 0.688.

The government of Iran has been implementing new plans such as creating the Chabahar Free Trade-Industrial Zone.

Industry is new to the province. Efforts have been done and tax, customs and financial motivations have caused more industrial investment, new projects, new producing jobs and improvement of industry. The most important factories are the Khash cement factory with production of 2600 tons cement daily and three other cement.

Factories under construction:

• Cotton cloth and fishing net weaving factories and the brick factory can be named as well.

The province has important geological and metal mineral potentials such as chrome, copper, granite, antimony, talc, manganese, iron, lead, zinc, tin, nickel, platinum, gold and silver.

One of the main mines in this province is Chel Kooreh copper mine in 120 km north of Zahedan.

Sistan embroidery has been an ancient handicraft of the region that has been traced as far back as 5th-century BC, originating from the Scythians.

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The city of Zahedan has been connected to Quetta in Pakistan for a century with a broad gauge railway. It has weekly trains for Kovaitah. Recently a railway from Bam, Iran to Zahedan has been inaugurated. There may be plans to build railway lines from Zahedan to Chabahar.

Sistan and Baluchistan province has two main passenger airports:

• Zahedan Airport
• Chabahar Airport (Konarak Airport)

The Port of Chabahar in the south of the province is the main port. It is to be connected by a new railway to Zahedan. India is investing on this port. The port stands on the Coast of Makran and is 70 km west of Gwadar, Pakistan.

1. University of Sistan and Baluchestan
2. Chabahar Maritime University
3. Zabol University
4. Islamic Azad University of Iranshahr
5. Islamic Azad University of Zahedan
6. Zahedan University of Medical Sciences
7. Zabol University of Medical Sciences
8. International University of Chabahar
9. Velayat University of Iranshar
10. Jamiah Darul Uloom Zahedan

Landmarks such as the Firuzabad Castle, Rostam Castle and the Naseri Castle are located in the province.

• 
  Naseri Castle, Iranshahr
• 
  Rostam Castle, in Hamun County

• Balochi cuisine
• Bazman, volcano mountain
• Baloch people
• Sistan region
• Balochistan region
• Balochistan, Afghanistan
• Balochistan, Pakistan

Media related to Sistan and Baluchestan Province at Wikimedia Commons

• W. Barthold (1984). "Sistan, the Southern Part of Afghanistan, and Baluchistan". An Historical Geography of Iran. Translated by Svat Soucek. Princeton University Press. pp. 64–86. ISBN 978-1-4008-5322-9.
• Kameel Ahmady (2019). From border to border. Comprehensive research study on identity and ethnicity in Iran. London: Mehri publication. ISBN 9781914165221.

• Official website of Sistan and Baluchestan Governorship
• Chabahar Free Trading Zone, Sistan and Baluchistan