The announcement was made today in Manchester as delegates from all 14 teams competing at RLWC2013 and representatives of the Rugby League International Federation gathered to make their first preparations for the tournament.
RLWC2013 General Manager Sally Bolton said: "It's great news for the tournament that the semi-finals will be a double header at Wembley.
"It's a stunning venue and has hosted some famous Rugby League World Cup games in the past.
"Having two matches back to back will make for a wonderful day of Rugby League with the four top teams going hammer and tongs for a place in the Rugby League World Cup Final.
"We know Old Trafford very well too, a venue that always delivers a fantastic Super League Grand Final for us. Holding the final there will allow the Rugby League community, the people of the North West and we hope many new fans to witness a fantastic spectacle."
For the full tournament schedule please visit www.rlwc2013.com