Siddhartha is an allegorical novel by Hermann Hesse which deals with the spiritual journey of an Indian boy called Siddhartha during the time of the Buddha.

The book, Hesse's ninth novel, was written in German, in a simple yet powerful and lyrical style. It was first published in 1922, after Hesse had spent some time in India in the 1910s. It was published in the U.S. in 1951 and became influential during the 1960s.