The 1910 British Lions tour to Argentina is a retrospective term applied to the tour of Argentina made by a side made up of 16 English players and 3 Scots. The organisers of the tour named the team the "English Rugby Union team", but the host country advertised the touring team as the Combined British. The 1910 team has been termed as one of the three "lost lions" tours, and is detailed on the British and Irish Lions official website. For Argentina, this tour marked the start of international rugby union and the test against the Combined British on 12 June 1910 was the first Test in the Argentine national team's history.
In 1910, a British side toured South Africa for the fourth time, being the eighth outing of a British touring side at this point. The South African tour was, however, the first official tour, in that it had the official sanction of the four home unions. Concurrently, RV Stanley, more famously known as Major Stanley of Oxford, later an England selector, organised a side to tour Argentina. John Raphael, the England fullback, was selected as the captain of this team, branded by Stanley as the England Rugby Union team. The hosts referred to the team as the Combined British, perhaps more appropriate given the squad included three Scots.
The Combined British played six matches, winning them all, including a victory over Argentina in their first ever test on 12 June 1910.