The Grote Spectrum Encyclopedie ("Great Spectrum Encyclopedia") (published by Het Spectrum, Utrecht between 1974 and 1980) is a Dutch encyclopedia which treats subjects in 5000 large and comprehensive articles (like the Encyclopædia Britannica) with a clear accent on the social sciences. The encyclopedia is functionally illustrated and consists of 20 volumes A-Z, and four index volumes with references to lemmas within the treated subjects. The fourth index volume also contains a comprehensive bibliography (which is not included in the articles themselves). A supplement (volume 25) appeared in 1984.
The rise of new storage media in the 1990s (CD-ROM, DVD) halted the plans for a second edition of the Grote Spectrum Encyclopedie. An actualised supplement did appear in 2002.