Ketevan the Martyr (Georgian: ქეთევან წამებული, romanized: ketevan ts'amebuli; died 13 September 1624) was a queen consort of Kakheti, a kingdom in eastern Georgia. She was regent of Kakheti during the minority of her son Teimuraz I of Kakheti from 1605 to 1614. She was killed in Shiraz, Iran, after prolonged tortures by the Safavid suzerains of Kakheti for refusing to give up the Christian faith and convert to Islam. She has been canonized as a saint by the Georgian Orthodox Church.

Ketevan was born to Prince Ashotan Bagration of Mukhrani and married Prince David Bagration of Kakheti, the future David I, King of Kakheti from 1601 to 1602.

After David's death, she engaged in religious building and charity. However, when David's brother Constantine I killed his reigning father, Alexander II, and usurped the crown with the Safavid Iranian support in 1605, Ketevan rallied the Kakhetian nobles against the patricide and routed Constantine's loyal force. The usurper died in battle. According to the Safavid official and chronicler, Fażli Ḵuzāni, Ketevan showed characteristic mercy to Constantine's surviving supporters and his Qizilbash officers. She ordered that the wounded enemy soldiers be treated accordingly and accepted in service if they desired. The Muslim merchants, who suffered in the war, were compensated and set free. Ketevan had Constantine's body laid to rest and sent to Ardebil.

After the uprising she negotiated with Shah Abbas I of Iran who was the suzerain over Georgia, to confirm her underage son, Teimuraz I, as king of Kakheti, while she assumed the function of a regent.

In 1614, sent by Teimuraz as a negotiator to Shah Abbas, Ketevan effectively surrendered herself as an honorary hostage in a failed attempt to prevent Kakheti from being attacked by the Iranian armies. She was held in Shiraz for several years until Abbas I, in an act of revenge for the recalcitrance of Teimuraz, ordered the queen to renounce Christianity, and upon her refusal, had her tortured to death with red-hot pincers in 1624. Portions of her relics were clandestinely taken by the St. Augustine Portuguese Catholic missioners, eyewitnesses of her martyrdom, to Georgia, where they were interred at the Alaverdi Monastery. The rest of her remains were said to have been buried at the Church of St. Augustine in Goa, India. After several expeditions to Goa in the 21st century to search for the remains, they were believed to be found in late 2013.

Queen Ketevan was canonized by Patriarch Zachary of Georgia (1613–1630), and September 13 (corresponding to September 26 in the modern Gregorian calendar) was instituted by the Georgian Orthodox Church as the day of her commemoration.

The account of Ketevan's martyrdom related by the Augustinians missioners was exploited by her son, Teimuraz, in his poem The Book and Passion of Queen Ketevan (წიგნი და წამება ქეთევან დედოფლისა, ts'igni da ts'ameba ketevan dedoplisa; 1625) as well as by the German author Andreas Gryphius in his classical tragedy Catharina von Georgien (1657). The Georgian monk Grigol Dodorkeli-Vakhvakhishvili of the David Gareja Monastery was another near-contemporaneous author whose writings, a hagiographic work as well as several hymns, focus on Ketevan's life and martyrdom. The Scottish poet William Forsyth composed the poem The Martyrdom of Kelavane (1861), based on Jean Chardin's account of Ketevan's death.

In 2008, it was discovered that Graça Convent in Lisbon, Portugal contained a previously unknown, large panoramic azulejo depicting Queen Ketavan's martyrdom in Persia. The scenes were based on accounts of her martyrdom by Portuguese Augustinian missionaries who witnessed her death. Panoramic tilework was in a state of disrepair and Georgia offered thousands of euros for repairs.