The first semi-final will kick off at 5.15pm on Saturday April 16 2005, with the second semi-final following on Sunday April 17 at 4pm. The BBC and Sky Sports will each broadcast one semi-final live.
This is the first time that the Millennium Stadium has been selected as an FA Cup semi-final venue. With a capacity of 74,525, it is larger than both Villa Park (42,602) and Old Trafford (68,210) which have hosted the semi-finals in recent years.
An FA spokesman said: "Taking the semi-finals to Cardiff will ensure that the semi-finals are played at a neutral venue and that the maximum number of fans are able to attend what are always great occasions.
"The Millennium Stadium has been a wonderful venue for the FA Cup Final since 2001, with a unique atmosphere for players and supporters alike."
Wales' national stadium has hosted FA Cup Finals since the matches moved to Cardiff in 2001.
There have been 30 club football matches played at the Millennium Stadium since it was built in 1999.
It has hosted four FA Cup Finals, four Community Shield matches, four Football League Cup finals, four sets of Football League Play-off Finals, one UEFA Cup clash and one 'Cardiff Capital Challenge' invitation match
