Wales will play their first December Test for 15 years when Warren Gatland's men host Australia in a post-World Cup friendly at the Millennium Stadium.
The Aussies will visit Cardiff on 3 December, the weekend before the third round of Heineken Cup pool fixtures.
"The Wales v Australia match is the perfect culmination of Wales' Rugby World Cup efforts," said WRU group head of sales and marketing Craig Maxwell.
"And the start of a new chapter as we look ahead to the 2012 Six Nations."
Wales' last December internationals were in 1996 when the national team were defeated by Australia and the then world champions South Africa at the old Cardiff Arms Park.
Australia - among the favourites to win the 2011 Rugby World Cup - have lost only once in their last seven meetings with Wales.