This book provides the reader with a clear overview of the considerable body of research and development work carried out in the last five years on microstructured polymer optical fibres (mPOFs) and the huge potential that they offer in a diversity of application areas. It will contain sections explaining the guiding mechanism in these fibres, the fabrication methods, the variety of fibres that can be made, the optical properties that can be achieved and an outline of potential applications. It will also explain the state-of-play with respect to current research and issues that have still to be resolved. It will also for the first time include details about the fabrication process for these fibres. This description will be extended to apply to other classes of microstructured fibres including those made from silica. The book provides an excellent introduction to this new technology, making it accessible to industry, technical and research audiences.