The Portuguese Wikipedia is the Portuguese-language edition of Wikipedia (written Wikipédia, in Portuguese), the free encyclopedia. It was started on 11 May 2001. Wikipedia is the nineteenth most accessed website in Brazil and the tenth most accessed in Portugal. , it is the largest Wikipedia by article count, containing articles.

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The Portuguese Wikipedia was the third edition of Wikipedia to be created, simultaneously with other languages. It started its activities on 11 May 2001, having reached the mark of one hundred thousand articles on 26 January 2006. From late 2004, the edition grew rapidly. In May 2005, it overtook both the Spanish and Italian language Wikipedias. By comparison, in May 2004 it was only the 17th Wikipedia by the number of articles. Portuguese articles can contain variations of writing, as European Portuguese and Brazilian Portuguese have differences in vocabulary and usage. Articles can contain written characteristics of one or the other variant depending on who wrote the article. The Portuguese Wikipedia community decided not to split a separate Brazilian Portuguese version off from the Portuguese Wikipedia. In 2005, a proposal to fork Portuguese Wikipedia and create a Brazilian Portuguese (pt-br) version was voted down by the Wikimedia community. In 2007 another one to create European Portuguese was rejected too by the Wikimedia community. In 2009 another one to create in Brazilian Portuguese was rejected, but this time by language committee, according to new policies to create new Wikipedia editions, with the following explanation: "Brazilian Portuguese is not a separate language.. this is a requirement." Beginning in January 2007, the project experienced a decrease of the share of edits by unregistered users (from around 20 to around 15%) and an increase of the share of such edits being reverted, from about 15% to a peak of 25% in late 2008, which suggests an increase in disruptive editing. In the same month, a JavaScript was added that forced all unregistered users to preview their edit before saving it. In December 2010, the Portuguese Wikipedia overtook the Dutch language Wikipedia in a number of articles, but in the first quarter of 2011, it was surpassed by the Russian and Dutch language Wikipedias, ranking in the tenth position. In April 2016, the project had 1388 active editors who made at least five edits in that month.

Characteristics

The Portuguese language Wikipedia is different from the English one in a number of aspects. As of 2019, the Portuguese Wikipedia had 316,000 unique categories, 3.57% of them lacking an appropriate page in the category namespace. The average article in this language version has nine categories, while the ratio of unique categories per article is 0.314. The largest number of articles belong to Arts (16%) and Geography (14%) categories. Articles related to Crime and Events have the highest average quality. Those related to Health are read more often, and articles in the Business category have the highest average author interest. In April 2022, the European Union's East StratCom Task Force published its findings that four pro-Russian disinformation outlets (SouthFront, NewsFront, InfoRos and Strategic Culture Foundation) were referenced in 45 articles of the Portuguese Wikipedia. This made it the fourth Wikipedia edition most affected by such disinformation, behind the Russian, Arabic and Spanish Wikipedias. They wrote: "On the English version of Wikipedia, there seems to be a consensus that state-sponsored disinformation sites aren't legitimate sources[...]. One can only guess whether other language versions will follow suit, but there is nothing stopping anyone from launching that debate, pointing out the English Wikipedia example as a best practice."