Sikhism has a distinct religious philosophy of its own. It differs from the fundamentals of the prominent world-religions. This short treatise gives an insight into the metaphysics, ethics, mysticism and cosmology of Sikhism. This monograph has been divided into two parts. The first part throws light on various aspects of Sikh philosophy. The second part is devoted to the comparative study of the prevailing contemporary religious systems of Jainism, Buddhism, Vedanta, Christianity and Islam, based on thoughts concerning them in the Sikh Scripture, Guru Granth Sahib Part 1 Philosophy of Sikhism in a Nutshell / 9 The Sikh Concept of Ultimate Reality / 15 Sikh Theology / 25 Sikh Ethics / 43 Three Major Concepts of Sikh Moral Philosophy / 47 Sikh Mysticism / 57 Meditation in Sikhism / 61 Sikh Cosmogony and Cosmology / 72 Sikh Concept of Creation / 77 Part 2 Comparative Sikh Philosophy Jainism and Guru Granth Sahib / 89 Shunyavada and Guru Granth Sahib / 99 Vishistadvaita and Guru Granth Sahib / 104 Kateb (The Books) and Guru Granth Sahib / 112 Guru Granth Sahib and Islam / 120