Rugby union in Samoa is the country's most popular sport. The national teams in both the standard 15-man game and rugby sevens are consistently competitive against teams from vastly more populous nations.

The Samoa national rugby union team represents the Samoa Rugby Union in men's international rugby union. They are also known as "Manu Samoa", which is thought to derive from the name of a Samoan warrior. They perform a traditional Samoan challenge called the siva tau before each game. Samoa Rugby Union were formerly members of the Pacific Islands Rugby Alliance (PIRA) along with Fiji and Tonga. They are ranked 11th in the world.