Therapeutic macromolecules and biologics have gained increasing importance in the last decade. Pulmonary and intranasal delivery of these therapeutic modalities, which have poor oral bioavailability, could constitute an attractive, non-invasive alternative to parenteral delivery. They can be considered for either topical use for treating diseases affecting the airways or for systemic use for treating a variety of other diseases. Therefore, this book is a readable, thoughtful, and useful guide on the latest research developments and the best options that people involved with pulmonary and intranasal route of administration and biologically active agents can bring to their practices. Furthermore, it explores the underlying scientific rationale for the strategies applied to overcome drug delivery challenges and provides insights to inspire further research in this growing area.