A fraternal organization, sometimes also known as a "fraternity," is an organization or club that represents the relationship between its members as akin to brotherhood. There is a great deal of overlap between the terms Friendly Society and fraternal organization. Most mystical organizations are also fraternal.

What follows is a list of contemporary fraternities.

• Ancient Mystical Order Rosae Crucis
• Ancient Order of Hibernians
• Benevolent and Protective Order of Elks
• B'nai Brith
• Charitable trust
• Civitan
• E Clampus Vitus
• Epsilon Sigma Alpha International
• Equestrian Order of the Holy Selpulchre of Jerusalem
• Fraternal Forestry (Ancient Order of Foresters, Ancient Order of United Workmen, Independent Order of Foresters)
• Freemasonry
  • Scottish Rite
  • York Rite
  • Shriners
  • Order of the Eastern Star
• Grand United Order of Odd Fellows
• Imperial Court System
• Independent Order of Odd Fellows
• International Order of Twelve Knights and Daughters of Tabor
• Junior Chamber International (Jaycees or Junior Chamber of Commerce)
  • United States Junior Chamber
• Kiwanis
  • Circle K International
  • Key Club
  • Builder's Club
  • K-Kids
  • Aktion Club
• Knights of Columbus
  • Columbian Squires
• Lions Clubs International
• Militia Templi
• Optimist International
• Orange Order
• Order of the Golden Spur
• Order of Pius IX
• Order of St Gregory the Great
• Ordo Templi Orientis
• International Red Cross and Red Crescent Movement
• Rosicrucian Fellowship
• Rotary International
• Ruritan
• Samaritans (charity)
• Scouts Royale Brotherhood (Alumni Association)
• Sertoma International
• Soroptimist
• Venerable Order of Saint John
• Woodmen of the World
• Zonta International
• Royal Antediluvian Order of Buffaloes

• Apex

• AKO Fraternity
• Canadian Order for Home Circles
• Knights of Pythias
• Scouts Royale Brotherhood (Toronto Canada Alumni Association)

• Afrikaner Broederbond

• Oddfellows
• Orange Order
• Order of Scottish Clans
• Order Tutor

• Afro-American Sons and Daughters
• Aid Association of Lutherans
• Alpha Kappa Rho
• Alpha Phi Omega
• Aura's House
• Chautauqua Institute
• Fraternal Order of Eagles
• Fraternal Order of Moai
• Fraternal Order Orioles
• Gamma Sigma Sigma
• Improved Order of Red Men
• Knights of Columbus
• Knights of Peter Claver
• Knights of Pythias
• Knights of the Golden Eagle
• Knights of the Maccabees
• Loyal Order of Moose
• National Haymakers Association
• Native Sons of the Golden West
• Omega Phi Alpha
• Order of Heptasophs
  • Improved Order of Heptasophs
• Order of Patrons of Husbandry (The Grange)
• Order of the Arrow (BSA)
• Order of Scottish Clans
• Order Sons of Italy in America
• Sons of Norway
• Sons of the American Revolution
• Sons of Union Veterans of the Civil War
• Thrivent Financial for Lutherans
• Unico National
• Woodmen of the World

• Muslim Brotherhood

• Alpha Phi Omega
• The Scintilla Juris Fraternity
• The Artists' Circle
• Scouts Royale Brotherhood/Sisterhood Inc.
• Scouts Royale Brotherhood - Professionals©
• Alpha Kappa RhoΆΚΡ

• Fraternity (disambiguation)
• List of civic and political organizations
• List of professional organizations
• Service club

David T. Beito, From Mutual Aid to the Welfare State: Fraternal Societies and Social Services, 1890-1967 (2000 book).

• Survey of Secret Societies and Museum of Fraternal Lithographs Survey of history and ritual covering diverse organizations including Freemasonry, and groups that have imitated Masonry such as the Odd Fellows, Knights of Pythias, Improved Order of Red Men, Knights of the Golden Eagle, Knights of the Maccabees, B'nai B'rith, Orange Order, Royal Black Preceptory, Hibernians, Greek Letter Fraternities, etc. and so-called magical fraternities such as the Ordo Templi Orientis and Aurum Solis.
• Complete listing of all secret society, fraternal organizations and fraternal orders with abbreviations, with slogans and mottoes
• The Web of Hiram A Site dealing with Freemasonry at Bradford University.
• FratBoyNews.com: All the Fraternity and Sorority News that fit to print, and most that isn't
• World Orders of Knighthood and Merit
• Catholic Encyclopedia entry for Military Orders