StarGuides 2001 represents the most comprehensive and accurately validated collection of practical data on organizations involved in astronomy, related space sciences and other related fields. This invaluable reference source (and its companion volume, StarBriefs 2001) should be on the reference shelf of every library, organisation or individual with any interest in these areas. The coverage includes relevant universities, scientific committees, institutions, associations, societies, agencies, companies, academies, bibliographic services, data centres, dealers, distributors, funding organizations, journals, manufacturers, meteorological services, national norms & standards institutes, parent associations & societies, publishers, software producers & distributors, and so on. Besides astronomy and associated space sciences, related fields such as aeronautics, aeronomy, astronautics, atmospheric science, chemistry, communications, computer sciences, data processing, education, electronics, engineering, energetics, environment, geodesy, geophysics, information handling, management, mathematics, meteorology, optics, physics, remote sensing, and many more are also covered where appropriate. After more than 25 years in continuous compilation, verification and updating, StarGuides 2001 currently gathers together over 6,200 entries from over 100 countries. The information is presented in a clear, uncluttered manner for direct and easy use. For each entry, all practical data are listed: city, postal and electronic mail addresses; telephone and fax numbers; URLs for WWW access; foundation years; numbers of members and / or numbers of staff; main activities; publication titles, frequencies, ISS-Numbers and circulations; names and geographical co-ordinates of observing sites; names of planetariums; awards, prizes or distinctions granted etc. The entries are listed alphabetically in each country. An exhaustive index gives a breakdown not only by different designations and acronyms, but also by location and major terms in names. Thematic sub-indices are also provided as well as a list of telephone and telefax national codes. In short, almost anyone involved in any way in the fields of astronomy and related space sciences will find invaluable contact and background information in this volume. All entries have been compiled from data supplied by each listed organisation and all data has been independently verified &endash; making it the most accurate and relevant source available.