Allauddin Khan (Bangla: ওস্তাদ আলাউদ্দীন খান, also known as Baba Allauddin Khan) (1862–1972), was a Bengali Indian classical sarodiya and multi-instrumentalist and one of the greatest music teachers of the 20th Century, father of Ali Akbar Khan and Annapurna Devi and guru to Ravi Shankar, Nikhil Banerjee, Vasant Rai, Pannalal Ghosh and other influential musicians. He himself was a disciple of many great musicians, most importantly the legendary Wazir Khan.