The House of Giray (Crimean Tatar: Geraylar, كرايلر, Ottoman Turkish: آل جنكيز, romanized: Âl-i Cengiz, lit. 'Genghisids'), also Girays, were the Genghisid/Turkic dynasty that reigned in the Khanate of Crimea from its formation in 1427 until its downfall in 1783. The dynasty also supplied several khans of Kazan and Astrakhan between 1521 and 1550. Apart from the royal Girays, there was also a lateral branch, the Choban Girays (Çoban Geraylar). Before reaching the age of majority, young Girays were brought up in one of the Circassian tribes, where they were instructed in the arts of war. The Giray khans were elected by other Crimean Tatar dynasts, called myrzas (mırzalar). They also elected an heir apparent, called the qalgha sultan (qalğa sultan). In later centuries, the Ottoman Sultan obtained the right of installing and deposing the khans at his will.
According to some scholars, the Girays were regarded as the second family of the Ottoman Empire after the House of Ottoman: "If Rome and Byzantium represented two of the three international traditions of imperial legitimacy, the blood of Genghis Khan was the third... If ever the Ottomans became extinct, it was understood that the Genghisid Girays would succeed them" 
During the 15th and early 16th centuries, the Giray Khan was second to the Ottoman Emperor, and superior to the Grand Vizier, in the Ottoman protocol. After the disobedience and removal of Mehmed II Giray, the sultan demoted the Crimean Khan to the level of Grand Vizier. The Giray Khans were also sovereigns of their own realm. They could mint coins, make law by decree, and had their own tughras.
The Crimean Khanate also made alliances with the Polish-Lithuanian Commonwealth, and the Zaporizhian Sich. The assistance of İslâm III Giray during the Khmelnytsky Uprising 1648 contributed greatly to the initial momentum of military successes for Cossacks. While relationship with the Polish-Lithuanian Commonwealth was also exclusive as the home dynasty of Girays used to seek sanctuary in Lithuania in 15th century before establishing on Crimean peninsula.
Other dynasts were permitted by the Russian authorities to reside in their Bakhchisaray palace. Selim III's young son, Qattı Giray, was converted by missionaries to Protestantism and married a Scottish heiress, Anne Neilson.
Since annexation, most of the Girays have lived in Turkey. Some of them, however, have lived in other countries. The last Crimean Khan, Şahin Giray's, grandsons and daughters lived in Bursa and Istanbul.