The band will use the dates to play their hits alongside tracks from last year's Where We Are and songs from their upcoming as-yet untitled studio album, which is due for release in November.
Westlife previously toured the UK in May, with singer Nicky Byrne being hospitalised at one point after injuring himself when wrestling bandmate Kian Egan after a show in Liverpool.
Tickets for next year's concerts go on sale this Friday at 9am.
The 2011 tour dates are as follows:
- March 7 - Cardiff, CIA
- March 11 - London, O2 Arena
- March 14 - Newcastle, Metro Radio Arena
- March 16 - Nottingham, Trent FM Arena
- March 18 - Liverpool, Echo Arena
- March 19 - Glasgow, SECC
- March 22 - Manchester, Evening News Arena
- March 25 - Birmingham, LG Arena
- March 27 - London, Wembley Arena
- March 28 - Sheffield, Motorpoint Arena