- Evan Amos, a New York City-based professional photographer known for his numerous stock images of video game consoles, which are frequently used in Wikipedia articles
- Amin Azzam, an American psychiatrist and clinical professor at the UCSF School of Medicine known for teaching a class of medical students which consists entirely of editing Wikipedia articles
- Hampton Catlin, an American computer programmer and programming language inventor who wrote several applications for iOS and other mobile platforms, including Wikipedia browsing client which was later purchased by the Wikimedia Foundation. Catlin was later hired by Wikimedia Foundation as Mobile development lead.
- Faizul Latif Chowdhury, Bangladeshi economist and writer who uses his real name to edit Wikipedia, primarily the Bengali-language edition
- William Connolley, a climate modeller who edits Wikipedia using his real name
- Danese Cooper, an American programmer, computer scientist and advocate of open source software. who worked with Wikimedia foundation as Chief Technical Officer.
- Lee Daniel Crocker, an American programmer best known for rewriting the MediaWiki, a software upon which Wikipedia, Wikimedia sites and many other content-management websites run, to address scalability problems.
- Anthony W. Czarnik, American biochemist, inventor, and professor.
- Florence Devouard, a French Wikipedian and former Chair of the Board of Trustees of the Wikimedia Foundation
- Mike Dickison, New Zealand's first "Wikipedian-at-large"
- Siân Evans, a librarian, activist, and co-founder of Art+Feminism, a global campaign that challenges gender bias on Wikipedia.
- Tomasz Ganicz, former president of Wikimedia Polska (2007–2018)
- Sue Gardner, former executive director, Wikimedia Foundation (2007–2014)
- Susan Gerbic, founder and leader of the Guerrilla Skepticism on Wikipedia (GSoW) project
- Mike Godwin, former general counsel for the Wikimedia Foundation (2007–2010)
- Martin Haase, a German linguistics professor at the University of Bamberg as well as a linguist, polyglot, and podcaster who is also a Wikipedia volunteer and served as a member of Wikimedia Germany's advisory board (2005–2007).
- Aaron Halfaker, a former research scientist at the Wikimedia Foundation
- James Heilman, a Canadian emergency department physician, Wikipedian, and advocate for the improvement of Wikipedia's health-related content.
- Miran Hladnik, Slovene literary historian
- Andrea James, transgender activist
- Dariusz Jemielniak, professor of management
- Richard J. Jensen, professor and historian
- Uładzimir Katkoŭski, a Belarusian blogger, web designer and website creator who was a founder of Bulgarian Wikipedia
- Rauan Kenzhekhanuly, a Kazakh entrepreneur and NGO activist who was named the first Wikipedian of the Year in August 2011 by Wikipedia co-founder Jimmy Wales at Wikimania.
- Bassel Khartabil, a Palestinian Syrian open-source software developer who contributed to projects like Creative Commons, Wikipedia, and Mozilla Firefox. On 15 March 2012, the one-year anniversary of the Syrian uprising, he was detained by the Syrian government at Adra Prison in Damascus. Khartabil was executed by the Syrian regime shortly after his disappearance in 2015.
- Justin Knapp, an American Wikipedian who in 2012 became the first person to make 1 million Wikipedia edits
- Dan Koehl, pioneer and first admin on Swedish Wikipedia and prolific contributor to different Wikimedia projects.
- Ihor Kostenko, a Ukrainian journalist, student activist and Wikipedian killed during the Euromaidan events.
- Andrew Lih, an American new media researcher, consultant and writer, as well as an authority on internet censorship in the People's Republic of China and a long-time Wikipedian.
- Katherine Maher, executive director of the Wikimedia Foundation since 2016
- Michael Mandiberg, co-founder of the Art+Feminism project
- Magnus Manske, developer of MediaWiki and related software tools
- Rémi Mathis, historian and curator
- Emna Mizouni, Wikipedian of the year, 2019
- Erik Möller, former deputy director of Wikimedia Foundation (2008–2015)
- Felix Nartey, a Ghanaian social entrepreneur and open advocate who was named the Wikimedian of the Year in August 2017 by Wikipedia Co-founder Jimmy Wales at Wikimania.
- Tron Øgrim, a Norwegian journalist, author and politician. He was active in Socialist Youth Union (later Red Youth) from 1965 to 1973, and a central figure in the Workers' Communist Party from 1973 to 1984. From 2005 till his death in 2007, he contributed to Wikipedia both online and offline.
- Tobias Preis, professor of social science
- Steven Pruitt, most edits and contributions to Wikipedia
- Simon Pulsifer, prolific Wikipedia contributor
- Steven Rubenstein, anthropologist
- Larry Sanger, co-founder of Wikipedia
- Tony Santiago, editor recognized in 2007 by the 23rd Senate of Puerto Rico for his contributions to Puerto Rico–related content
- Seedfeeder, explicit illustrator
- María Sefidari, Chair of Wikimedia Foundation Board of Directors
- David Shankbone, photographer and blogger
- Revo Soekatno, linguistic researcher. Co-founder of Wikimedia Indonesia
- Jan Sokol, Czech philosopher, university professor and promoter of WMCZ project Senior Citizens Write Wikipedia
- Rosie Stephenson-Goodknight, joint Wikimedian of the Year (2016)
- Aaron Swartz, programmer and political activist
- Sandister Tei, Wikimedian of the Year, 2020. Co-founder of Wikimedia Ghana User Group.
- Emily Temple-Wood, Joint Wikimedian of the Year (2016)
- Lila Tretikov, former executive director of the Wikimedia Foundation (2014–2016)
- Jess Wade, physicist
- Adrianne Wadewitz (1977–2014), an American Wikipedian and scholar of 18th-century British literature
- Jimmy Wales, co-founder of Wikipedia
- Maia Weinstock
- Taha Yasseri, social scientist at the University of Oxford
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- Chris Wilson (15 Jan 2016), "Why Wikipedia Is in Trouble", TIME
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