Indomitable Spirit is a book authored by A.P.J. Abdul Kalam, the former president of India. The cover page of the book says it brings together the values,thoughts and ideas of President Kalam as reflected in his speeches and addresses. Interspersed with interesting anecdotes and observations, Indomitable Spirit represents the quintessential A.P.J. Abdul Kalam—the man, the scientist, the teacher and the president.