Generally, Tri Nations refers to a sports competition between three national representative teams.
3 Nations, Tri Nations, or variation, may refer to:
Sports
Rugby
In rugby union
Tri Nations (rugby union), between Australia, New Zealand and South Africa (superseded by The Rugby Championship)
Pacific Tri-Nations, between Fiji, Samoa and Tonga
North African Tri Nations, between Algeria , Morocco and Tunisia
In rugby league
Rugby League Tri-Nations, between Australia, New Zealand and Great Britain
Rugby League European Championship B, the inaugural edition was referred to as the Central Europe Development Tri-nations
Other sports
Three Nations Senior Lacrosse League
Beach Cricket Tri-Nations series
Tri Nations (association football)
3 Nations Cup in women's ice hockey
Other uses
Republic of Three Nations, a proposed country composed of Poland, Lithuania and Ruthenia
Union of Three Nations, an upper classes pact against the peasantry in Transylvania
Three Nations Crossing, a bridge in Canada, Akwesasne, USA
Three-Nations Research Institute, a Japanese research company
"Three Nations", a song by 21 Savage, Natanael Cano, and French Montana from Official FIFA World Cup 2026 Album, 2026