The Indonesian Wikipedia (Indonesian: Wikipedia bahasa Indonesia, WBI for short) is the Indonesian-language edition of Wikipedia. It ranks 21st in terms of depth among Wikipedias. Its first article was written on 30 May 2003, yet its main page was created six months later, on 29 November 2003.

There are 752,732 articles in the Indonesian Wikipedia. In April 2016, there were 462 editors who made at least five edits in that month.

Although the Indonesian language is similar to the Malay language, the Indonesian Wikipedia remains separate from the Malay Wikipedia (initiated in October 2002) because they were started separately by two different user groups within six months of each other. In 2009, Andrew Lih wrote "Because these groups are drawn on national boundaries, merging is not likely to happen soon."

Indonesian is a normative form of the Malay language, an Austronesian (or Malayo-Polynesian) language which had been used as a lingua franca in the Indonesian archipelago for centuries, and was elevated to the status of an official language with the Indonesian Declaration of Independence in 1945, drawing inspiration from the Sumpah Pemuda (Youth Pledge) event in 1928. Although it is very similar to the official Malaysian form of the language, it does differ from the Malaysian form in some ways, with key differences in pronunciation and vocabulary, due in large part to the many Dutch words in the Indonesian vocabulary. It is spoken as a mother tongue by only about 7% of the population in Indonesia, but altogether more than 200 million people speak it. The Malay language is spoken by ethnic groups who reside in the Malay Peninsula, southern Thailand, parts of the Philippines, and Singapore. Malay is also considered one of the dialects of the Indonesian language by Indonesians living in central eastern Sumatra, the Riau Islands and parts of the coast of Borneo.

In 2004, Tempo magazine published a feature about the Indonesian Wikipedia, in which Revo Soekatno, one of its best known contributors, described it as the "Encyclopedia from the boarding houses", meaning an encyclopedia that was produced by Indonesians living and studying overseas. The article contributed to the popularization of Wikipedia in the archipelago. Since then, the Indonesian Wikipedia has seen its number of users rise remarkably.

In 2006, following Time featuring "You" as its person of the year, Kompas published a feature article on Revo where he was called the "Father of Wikipedia in Indonesian". The article highlighted the spirit of participation as the type of "addiction to the cyberspace that needed to be endorsed". Other Indonesian publications followed suit to refer to Revo Soekatno as an "activist that built a community portal in Indonesia" praising his contributions to the presence of Indonesia in the Internet.

In February 2009, the Indonesian Wikipedia achieved the milestone of 100,000 articles. One of the contributors mentioned in the article was the user borgx, who made 80,000 edits starting in 2005. That year, the Indonesian Wikipedia only had about fifty active contributors.

In March 2007, Bina Nusantara University invited Indonesian Wikipedians to speak at the first Wikipedia seminar for the public and to introduce Wikipedia Bahasa Indonesia and Wikimedia Foundation projects at its campus in Jakarta.