Rugby is the national sport of the Shaelic Commonwealth and considered a large part of the national culture. The sport is thought to have reached the nation in the early 220s, with the national body, the  Commonwealth Rugby Union (CRU) being formed in 236 AP.

The national team play out of the CRU-owned New Commonwealth Grounds, and compete annually in the Four Unions Championship, as well as having competed at the VRB World Cup. The team is ranked as a Tier-1 nation by the Vexillium Rugby Board (VRB).

The main domestic competitions in the Shaelic Commonweath are the North Eras Cup, the Commonwealth Championship, which consists of fourteen provincial sides, and the National Rugby Premiership.

Rugby in the Shaelic Commonwealth is played at both the professional and recreational level, by men, women, and youth of all skill levels.

The sport receives widespread media coverage around the nation from major media outlets. National team matches are nationally televised events, as even friendlies will draw huge ratings. The Commonwealth Championship final is one of the most watched broadcasts of each year. Coverage of rugby is strong at the local level as well, with even National Division Two clubs or regional leagues clubs receiving coverage in newspapers and local media outlets.

It is often said that practically every rugby match played in the nation is broadcast on radio, which speaks to the enormous popularity of the sport in Shaelic culture.