The 2013 IRB Nations Cup was the eighth edition of the international rugby union tournament, a competition created by the International Rugby Board. For the seventh time in a row, it was held in Bucharest, Romania. It was played between 8 June and 16 June and ran alongside the 2013 IRB Tbilisi Cup in Georgia. All fixtures were played at the 5,000 capacity Stadionul Naà £ional de Rugby, the Home stadium for Hosts .
Hosts were joined by ENC side and regular A sides Italy A and 2012 IRB Nations cup runners-up, Argentina Jaguars.
Romania retained the title they won in 2012 by winning all three of their matches.