25th Anniversary of the Internet's First Website 21. December 2015 Administrator Comments (0) TweetThe world's first website debuted on December 20th,  1990.  Read more at the Huffington PoShareThe world's first website debuted on December 20th, 1990. Read more at the Huffington Post for more details, and remember to thank Tim Berners-Lee for inventing the world wide web.