Iroquois Confederacy, a group of First Nations/Native American peoples: Mohawk, Oneida, Onondaga, Cayuga, Seneca, and Tuscarora
Six Nations land cessions, in the late 17th and 18th centuries to British North America
Six Nations of the Grand River, First Nations reserve in Canada
Six Nations Polytechnic, third-level college in the reserve
Celtic League, alliance of six "Celtic nations" (Ireland, Scotland, Wales, Brittany, Cornwall, Isle of Man)
Sports
Six Nations Championship, an annual European men's rugby union competition involving England, Scotland, Wales, Ireland, France, and Italy
Six Nations Under 20s Championship, under-20 men's equivalent
Women's Six Nations Championship, women's equivalent
Six Nations Tournament (ice hockey), a 1994–1996 European competition for men's ice hockey clubs from Italy, Austria, France, Slovenia, Netherlands, and Denmark
ICC Six Nations Challenge, a 2000–2004 men's cricket tournament for various teams below Test status.
Nations Cup (netball), an annual tournament held in Singapore
See also
Six-party talks, international discussions with an aim to find a peaceful resolution to security concerns resulting from the North Korean nuclear weapons program