Allauddin Khan (Bengali: ওস্তাদ আলাউদ্দীন খ়ান, also known as Baba Allauddin Khan) (ca. 1862 – 6 September 1972) was a Bengali shorodi and multi-instrumentalist, composer and one of the most renowned music teachers of the 20th century in Indian classical music.In 1935, he toured Europe, along with Uday Shankar's ballet troupe, and later also worked at his institute, 'Uday Shankar India Culture Centre' at Almora for a while.