Alauddin Ali Shah (reign: 1339–1342, originally known as Ali Mubarak) was an independent ruler of Lakhnauti, the old capital of Bengal.
Being ousted from Delhi, he first worked under Qadar Khan, the Governor of Lakhnauti. After the death of Qadar Khan, Alauddin killed the deputy governor and ascended to the power of Lakhnauti in 1339 by taking the opportunity of Sultan Muhammad bin Tughluq's involvement in other areas of his Sultanate. Around the same time, in 1338, Fakhruddin Mubarak Shah of Sonargaon and Shamsuddin Ilyas Shah of Satgaon, the founder of the Ilyas Shahi dynasty, who is sometimes referred to as Alauddin's foster brother, became independent as well, and thus began a tripartite power struggle in Bengal.Ibn Batuta described the struggle between him and Fakhruddin Shah as a bitter one. During his rule of nearly three years, he transferred his capital from Lakhnauti to Pandua (later named Firozabad).
In 1342, he was defeated and killed in a battle against Shamsuddin Ilyas Shah.