Boran (also spelled Buran, Middle Persian: ) was Sasanian queen (banbishn) of Iran from 630 to 632, with an interruption of some months. She was the daughter of king (or shah) Khosrow II (r. 590–628) and the Byzantine princess Maria. She is the second of only three women to rule in Iranian history, the others being Musa of Parthia, and Boran's sister Azarmidokht.

In 628, her father was overthrown and executed by her brother-husband Kavad II, who also had all Boran's brothers and half-brothers executed, initiating a period of fractionalism within the empire. Kavad II died some months later, and was succeeded by his eight-year-old son Ardashir III, who after a rule of nigh two years, was killed and usurped by the Iranian military officer Shahrbaraz. Boran shortly ascended the throne with the aid of the military commander Farrukh Hormizd, who helped her to overthrow Shahrbaraz. She and her sister were the only legitimate heirs who could rule at the time. Boran inherited a declining empire that was engulfed in a civil war between two major factions, the Persian (Parsig) and Parthian (Pahlav) noble-families. She was committed to reviving the memory and prestige of her father, during whose reign the Sasanian Empire had grown to its largest territorial extent.

She was however not long afterwards replaced by Khosrow II's nephew Shapur-i Shahrvaraz, whose reign was even briefer than hers, being replaced by Azarmidokht, who was a Parsig nominee. She was in turn deposed soon afterwards and killed by the Pahlav under Farrukh Hormizd's son Rostam Farrokhzad, who restored Boran to the throne, thus making her queen for a second time. During her second reign, power was mostly in the hands of Rostam, which caused dissatisfaction among the Parsig and led to a revolt, during which Boran was killed by strangulation. She was succeeded by her nephew Yazdegerd III, the last Sasanian ruler, making her the penultimate ruler of the Sasanian Empire.

Albeit her two tenures of rule were shortlived, she did try to bring stability to Iran by the implementation of just laws, reconstruction of the infrastructure, and by lowering taxes and minting coins. Diplomatically, she desired good relations with her western neighbours the Byzantines, sending them an embassy which was well received by emperor Heraclius (r. 610–641).

Boran's name appears as Bōrān (or Burān) on her coinage, which is considered by the French historian Gignoux to be a hypocoristic from *baurāspa ('having many horses'). The medieval Persian poet Ferdowsi refers to her as Pūrāndokht in his epic poem, the Shahnameh ('The Book of Kings'). The suffix of dokht (-dukht in Middle Persian), meaning 'daughter', was a new development made in Middle Iranian languages to more easily differentiate a female's name from that of a male. The suffix should not be taken too literally. Her name appears as Boran (and similar) in the Chronicle of Khuzestan (7th-Century), Jacob of Edessa's Chronicle (8th-Century), in the Chronicle of Seert (9th-Century ?), in Agapius of Hierapolis's Kitab al-'Unwan (10th-Century) and in Michael the Syrian's Chronicle (12th-Century), as Βοράνη(ς) (Boránes) in Theophanes the Confessor's Chronicle (9th-Century), as Բորն (Born) in Tovma Artsruni's History of the House of Artsrunik (9th-Century), Baram in the Chronicle of 1234, George Kedrenos's Synopsis historion (11th-Century) and Bar Hebraeus's Chronicle (13th-Century), Tūrān Dukht in the works of the 10th-century Persian historian Muhammad Bal'ami, Queen Bor by the 7th-century Armenian historian Sebeos, and Dukht-i Zabān by the 8th-century Arab historian Sayf ibn Umar.

Boran was the daughter of the last prominent shah of Iran, Khosrow II (r. 590–628) and the Byzantine princess Maria. Khosrow II was overthrown and executed in 628 by his own son Sheroe, better known by his dynastic name of Kavad II, who proceeded to have all Boran's brothers and half-brothers executed, including the heir Mardanshah. This dealt a heavy blow to the empire, from which it would never recover. Boran and her sister Azarmidokht reportedly criticized and scolded Kavad II for his barbaric actions, which caused him to become remorseful. According to Guidi's Chronicle, Boran was also Kavad II's wife, demonstrating the practice in Zoroastrianism of Khwedodah, or close-kin marriage.

The fall of Khosrow II culminated in the Sasanian civil war of 628–632, with the most powerful members of the nobility gaining full autonomy and starting to create their own government. The hostilities between the Persian (Parsig) and Parthian (Pahlav) noble-families were also resumed, which broke up the wealth of the nation. A few months later, the devastating Plague of Sheroe swept through the western Sasanian provinces. Half the population, including Kavad II himself, perished. He was succeeded by his eight-year-old son, who became Ardashir III. Ardashir's ascension was supported by both the Pahlav, Parsig, and a third major faction named the Nimruzi. However, sometime in 629, the Nimruzi withdrew their support for the king, and started to conspire with the distinguished Iranian general Shahrbaraz to overthrow him.

The Pahlav, under their leader Farrukh Hormizd of the Ispahbudhan clan, began supporting Boran as the new ruler of Iran, who subsequently started minting coins in the Pahlav areas of Amol, Nishapur, Gurgan and Ray. On 27 April 630, Ardashir III was killed by Shahrbaraz, who in turn was murdered, after a reign of forty days, in a coup by Farrukh Hormizd. Farrukh Hormizd then helped Boran ascend the throne, sometime in late June 630. Her accession was most likely due to her being the only remaining legitimate heir of the empire able to rule, along with Azarmidokht.