The 2010–12 European Nations Cup is the premier rugby union competition below the Six Nations Championship in Europe.

From 2009 onward, the title is awarded according to a one-year ranking.

[1] The competition was altered slightly for the 2010–2012 edition.

The champions of 1B will be promoted to 1A for 2013–14, while the last placed team in each division will be relegated.

[4] Unlike the previous edition, which also functioned as the 2011 Rugby World Cup qualifying, the 2011–2012 Division 1A edition has no additional purpose.