Mirza Abū'l-Khair Mūhammed Khan bin Qājı Abdūllah Sultan (Kazakh: میرزا ابو الخیر محمد خان بن حاجی عبد الله سلطان, Мырза Әбілқайыр Мұхаммед хан бин Қажы Абдұллаh Сұлтан, Myrza Äbılqaiyr Mūhammed Han bin Qajy Abdūllah Sūltan, [mərˈzɑ æˌbɘʟ̠qɑˈjər mʊχɑmˈmʲet χɑn bɯjn qɑˈʒə ɑbdʊɫ̚ˈɫɑ(h) sʊɫˈtɑn]), more commonly known by his short name Abū'l-Khair Khan (1693–1748) was leader of the Kazakh Little jüz in present-day western and central Kazakhstan.

Under the strong leadership of Abu'l-Khair, the Muslim Kazakh ghazis defeated Dzungar forces at the Bulanty river in 1726 and in the Battle of Anrakai in 1729.

Abu'l Khair Khan was born as the second oldest son of Hajji (Qajı) Abdullah Sultan, a Kazakh mırza (aristocrat) who had quickly risen to the royal ranks after completing his hajj to Mecca.

In an attempt to unite his empire and prevent anyone from defecting and helping out the Dzungars, Abu'l Khair Khan also fostered a strong religious identity among the Sunni Muslim Kazakhs.

[1] He subsequently tried to limit the amount of Russian influence exercised over the Kazakh Little jüz since he still wanted his empire to function as an independent Islamic state.