This textbook is intended to give an understanding of the basic principles that constitute the field of non-conventional polymers containing inorganic and organometalic units as the repeating units. Each chapter will be self-explanatory with a good background so that it can be easily understood at the senior undergraduate level. The principles involved in the preparation of these polymers, their characterisation and their applications will be discussed. Basic inorganic chemistry required for the understanding of each topic is presented so that the content of the chapter is readily understood. All the major inorganic and organometallic polymers such as polyphosphazenes, polysilanes, polysiloxanes, poly-thiazyl, poly-ferrocenes and other polymers containing main group elements will be dealt with.