Terken Khatun (Persian: ترکان خاتون‎) (died c. 1094) also known as Turkan Khatun ("the Queen of the Turks") was the Empress of the Seljuk Empire as the first wife and chief consort of Malik Shah I, Sultan of the Seljuk Empire from 1072, until his death in 1092. She was born as a Karakhanid princess, the daughter of Tamghach Khan Ibrahim. She was the mother of Mahmud I, the next ruler of the Seljuk Empire, and regent during his minority in 1092-1094.

Alp Arslan, father of Malik-Shah gave his own daughter Princess Aisha Khatun to Sham al-Mulk Nasr, the son and successor of the Qara Khanid Tamghach Khan Ibrahim, Terkhan Khatun's father. Later in 1065 he married his son to Terken Khatun, who was aged twelve at the time and Malik-Shah was about the same age. Nizam al-Mulk's position vis-à-vis the sultan was thus to some extant unsatisfactory, and his influence at the subordinate households of the sultan's wives and those of the princes was still weaker. Terken Khatun's household became the focus of opposition, for Taj al-Mulk was also her personal intendant. The vizier doubtless had Terken Khatun in mind when in the Siyasat-Nama he denounced the malevolent influence of women at court, citing their misleading advice to the ruler and their susceptibility to promptings from their attendants and eunuchs. Terken Khatun's son Dawud had been his father's favourite son, but he died in 1082. Six years later Malik-Shah had capital approval when he proclaimed as heir another of his sons, Abu Shuja Ahmad, and gave him a resplendent string of honorifics, but in the following year he too died. After these disappointments it was not surprising that Terken Khatun wanted to promote the succession of her third son Mahmud, despite the fact that he was the youngest of all the possible candidates.

Towards the end of Malik-Shah's reign, Qodun, the shahna of Marv, complained to the Sultan that he had been seized by Nizam al-Mulk's son, Shams al-Din Uthman who was rais of Marv. Malik Shah wrote to Nizam al-Mulk reproaching him with these words, "These your children have each gained the mastery over a large district and govern large province. But this does not satisfy them and they exceed what a politic and desire to do this and that." Nizam al-Mulk defended himself but on this occasion the Sultan's jealousy was not assuaged and he began to plot against the life of the vizier. Terken Khatun added fuel to the fire, accusing Nizam al-Mulk of dividing the kingdom among his children. Her apposition to Nizam al-Mulk was due to his having urged Malik Shah to nominate Barkiyaruq, the tirteen year old son of Zubaida Khatun, heir apparent, whereas she wished her own son Mahmud, an infant, to be so nominated and was supported in this by Taj al-Mulk Abu'l-Ghana'im Marzban ibn Khusrau Firuz, was vizier to Terken Khatun. She joined an intrigue mounted against Nizam al-Mulk by Taj al-Mulk, Majid al-Mulk Baravistani Qummi, the mustaufi, Sadid al-Mulk, the aird.

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