As of 2026-10-12, The Salvation Army tops the list with 1,650,000 members.
- #1 The Salvation Army — 1,650,000 members
Evangelical Christian church and charitable organisation
The Salvation Army is a Methodist Christian church and an international charitable organisation aligned with the Wesleyan-Holiness movement. It was founded and headquartered in London, England. The organisation reports a worldwide membership of over 1.7 million Salvationists, consisting of "soldiers", officers, and adherents who are collectively known as salvationists. Its founders sought to bring salvation to the poor, destitute, and hungry by meeting both their "physical and spiritual... Read more on Wikipedia.
Wikidata - #2 Workers' Samaritan Foundation Germany — 1,553,140 members
German charitable organization
Arbeiter-Samariter-Bund Deutschland or ASB is a German charitable aid agency founded in 1888. Read more on Wikipedia.
Wikidata - #3 Rotary International — 1,400,000 members
international non-profit service organization
Rotary International is a global service organization, headquartered in Evanston, Illinois, that is one of the largest service organizations in the world. The self-declared mission of Rotary, as stated on its website, is to "provide service to others, promote integrity, and advance world understanding, goodwill, and peace through fellowship of business, professional, and community leaders". It is a non-political and non-religious organization. Membership is by application or invitation and... Read more on Wikipedia.
Wikidata - #4 Social Association Germany — 636,707 members
non-profit association that promotes the social interests of its members
The Sozialverband Deutschland is a German socio-political advocacy organisation. It was founded in 1917 with a focus on assisting veterans of World War I as the Bund der Kriegsteilnehmer und Kriegsbeschädigten, in 1918 became the Reichsbund der Kriegsbeschädigten und Kriegsteilnehmer, and in 1999, after several further changes of name, became the Sozialverband Deutschland, with the note that it was founded in 1917 as the Reichsbund. Read more on Wikipedia.
Wikidata - #5 Institute of Electrical and Electronics Engineers — 423,000 members
American professional association for electronic engineering and electrical engineering
The Institute of Electrical and Electronics Engineers is an American 501(c)(3) charitable professional organization for electrical engineering, electronics engineering, and related disciplines. Read more on Wikipedia.
Wikidata - #6 Arbeiterwohlfahrt — 317,767 members
charitable organization in Berlin, Germany, founded 1919 by Marie Juchacz
source Wikidata - #7 National Trust for Scotland — 300,000 members
conservation charity that protects and promotes Scotland's natural and cultural heritage
The National Trust for Scotland is a Scottish conservation organisation. It is the largest membership organisation in Scotland and describes itself as "the charity that cares for, shares and speaks up for Scotland's magnificent heritage". Read more on Wikipedia.
Wikidata - #8 The Woodland Trust — 289,000 members
Woodland conservation charity in the UK
The Woodland Trust is the largest woodland conservation charity in the United Kingdom and is concerned with the creation, protection, and restoration of native woodland heritage. It has planted over 68 million trees since 1972. The Woodland Trust has three aims: to protect ancient woodland which is rare, unique and irreplaceable, to promote the restoration of damaged ancient woodland, and to plant native trees and woods to benefit people and wildlife. Read more on Wikipedia.
Wikidata - #9 Roman Catholic Diocese of Clifton — 170,700 members
diocese of the Catholic Church in the United Kingdom
The Diocese of Clifton is a Latin Church diocese of the Catholic Church centred at the Cathedral Church of Saints Peter and Paul in Clifton, England. Read more on Wikipedia.
Wikidata - #10 People's Solidarity — 100,100 members
German welfare organization
People's Solidarity is an organisation for elderly people in the new states of Germany, founded 1945. It was one of many important non-parliamentary mass organisations in the former socialist country, East Germany. The organisation required that members pay a "certain amount of money to support senior homes and organized cultural events for seniors." Within the Politics of the German Democratic Republic, People's Solidarity "nevertheless played a key role in East German society." It had 2.15... Read more on Wikipedia.
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