Editing Mensa International (section)

==Organizational structure==
[[File:National Mensas.svg|thumb|Countries that have a national Mensa, 2021]]
Mensa International consists of around 150,000 members in 100 countries<ref name="AboutMensa" /> and in 54 national groups.<ref name=":1" /> The national groups issue periodicals, such as ''Mensa Bulletin'', the monthly publication of American Mensa,<ref name="mb">{{cite web |last=American Mensa |title=Mensa Bulletin |url=https://www.us.mensa.org/read/bulletin/ |access-date=2023-02-22 |work=www.us.mensa.org}}</ref> and ''Mensa Magazine'', the monthly publication of British Mensa.<ref name="mm">{{cite web |last=British Mensa |title=Mensa Magazine |url=https://mensa.org.uk/mensa-magazine/ |access-date=2023-02-22 |work=mensa.org.uk}}</ref> Individuals who live in a country with a national group join the national group, while those living in countries without a recognized chapter may join Mensa International directly.<ref>{{Cite web |title=Contact Us |url=https://www.mensa.org/contact-us/ |access-date=2024-12-02 |website=Mensa International |language=en}}</ref>

The largest national groups are:<ref>{{Cite news |author=Stanislav Dimov |date=22 October 2011 |title=Thinking lessons introduced at school |publisher=Europost |url=http://www.europost.bg/article?id=2921 |url-status=dead |access-date=13 July 2014 |archive-url=https://web.archive.org/web/20140714210354/http://www.europost.bg/article?id=2921 |archive-date=14 July 2014}}</ref> 
* American Mensa, with more than 50,000 members<ref>{{cite web |last=American Mensa |title=About Us |url=https://www.us.mensa.org/learn/about/ |access-date=2023-05-06 |website=www.us.mensa.org |publisher=}}</ref>
* Mensa Germany, with more than 18,000 members<ref>{{cite web |last=Mensa in Deutschland |title=Über Mensa in Deutschland |url=https://www.mensa.de/about/  |access-date=2025-04-16 |website=mensa.de |publisher=}}</ref>
* British Mensa, with about 18,000 members in the UK and Ireland<ref>{{cite web |last=British Mensa |title=About Us |url=https://mensa.org.uk/about/ |access-date=2023-05-06 |website=mensa.org.uk |publisher=}}</ref>
Larger national groups are further subdivided into local groups. For example, American Mensa has 134 local groups, with the largest having over 2,000 members and the smallest having fewer than 100.

Members may form [[special interest group]]s (SIGs) at international, national, and local levels; these SIGs represent a wide variety of interests, ranging from motorcycle clubs to entrepreneurial co-operations. Some SIGs are associated with various geographic groups, whereas others act independently of official hierarchy. There are also electronic SIGs (eSIGs), which operate primarily as email lists, where members may or may not meet each other in person.<ref>{{Cite web |title=Mensa Special Interest Groups |url=https://www.us.mensa.org/connect/sigs/ |access-date=2024-12-02 |website=American Mensa |language=en}}</ref>

The Mensa Foundation, a separate charitable U.S. corporation, edits and publishes its own ''Mensa Research Journal'', in which both Mensans and non-Mensans are published on various topics surrounding the concept and measure of intelligence.