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.

All fixtures were played at the 5,000 capacity Stadionul Naţional de Rugby, the Home stadium for Hosts Romania.

[1] Hosts Romania were joined by ENC side Russia 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.