The Fortran 2003 Handbook is a definitive and comprehensive guide to Fortran 2003 and its use. Fortran 2003, the latest standard version of Fortran, has many excellent features that assist the programmer in writing efficient, portable and maintainable programs. This book is an informal description of Fortran 2003, developed to provide not only a readable explanation of features, but also some rationale for the inclusion of features and their use. Topics and features include: The syntactic features of the language are described completely in the appendices; Each chapter begins with a summary of the main terms and concepts described in the chapter; Each of the intrinsic procedures is described in detail; The complete syntax of Fortran 2003 is supplied; Contains a listing of the new and obsolescent features; Numerous examples are given. This handbook is intended for anyone who wants a comprehensive survey of Fortran 2003, including those familiar with programming language concepts but unfamiliar with Fortran.