The book "Inflationary Cosmology" offers a comprehensive introduction to inflationary cosmology, which emerged about 25 years ago. It addresses the phase of accelerated expansion of the early universe, solving crucial problems of standard cosmology. The authors, renowned scientists in this field, present various scenarios and discuss the associated challenges. This work is aimed at both experienced and emerging physicists, cosmologists, and astrophysical observers seeking a well-founded and comprehensible presentation of the subject. The combination of an educational approach and authoritative contributions makes it a valuable resource for anyone interested in the fundamentals and current developments of inflationary cosmology.