Den Store Danske Encyklopædi

Den Store Danske Encyklopædi (lit. 'The Great Danish Encyclopedia') is the most comprehensive contemporary Danish-language encyclopedia. The 20 volumes of the encyclopedia were published successively between 1994 and 2001; a one-volume supplement was published in 2002 and two index volumes in 2003. The work comprises 115,000 articles, ranging in size from single-line cross references to the 130-page entry on Denmark. The articles were written by a staff of about 4,000 academic experts led by editor-in-chief Jørn Lund. Articles longer than a few dozen lines are signed by their authors. Many articles are illustrated.

The encyclopedia was published by Danmarks Nationalleksikon A/S (Denmark's National Encyclopedia), a subsidiary of Denmark's publishing house Gyldendal that was set up for the purpose. The project was inspired by the almost contemporary Swedish Nationalencyklopedin; it received financial support from the Augustinus Foundation and was backed by a governmental inflation guarantee on pre-paid subscriptions. Eventually about 35,000 copies were sold.

An online version was available from 2009 to 2017, and its contents were incorporated into Lex – Denmark's National Encyclopedia when it launched in 2020.