Mensa Polska
- The constitution, board, and dates of testing sessions. [Polish and English.]
- http://www.mensa.org.pl/

British Mensa
- Information about the Society and the benefits of joining. Features online IQ puzzles and tests.
- http://www.mensa.org.uk/

Mensa Portugal (Official Project)
- The main purpose of this site is to become the starting point for the creation of the future Mensa Portugal, that will be the Portuguese Group of Mensa. Tests, resources and a public Forum are available to all visitors.
- http://www.cpsimoes.net/mensapt/

Mensa Luxembourg
- Mensa Luxembourgs official website.
- http://www.mensa.lu/

Irish Mensa
- National Mensa group for the Republic of Ireland.
- http://www.mensa.ie/

Hellenic Mensa
- Read about the activities Greek Mensa offers their members; find info on how to take their IQ-test and how to join. Bilingual (Greek/English).
- http://www.mensa.org.gr/

Mensa Sweden
- The website of the Swedish national chapter of Mensa offers information on joining, testing, activities and a trial test. Primarily in swedish, but also with english content.
- http://www.mensa.se/

Mensa Austria
- Information and photos of group activities.
- http://at.mensa.org

Mensa Serbia and Montenegro
- Information about testing, special interest groups, past events, and links to regional groups.
- http://www.mensa.org.yu/

Mensa Switzerland
- The Swiss section of Mensa presents information about its members and its activities, and about Mensa in general.
- http://www.mensa.ch/

Mensa Germany
- Contact information, IQ tests, information on intelligence and IQ
- http://www.mensa.de

Mensa Czech Republic
- Contact information, activity schedule
- http://www.mensa.cz

Mensa Belgium-Luxembourg
- SIG and national group activities, a member list, and an on-line IQ test.
- http://www.mensa.be/index.html