- Amsterdam: Oude Rai ()
- Athens, OH: Ohio University ()
- Belfast: Odyssey Arena ()
- Birmingham: Odeon ()
- Blackpool: Opera House ()
- Boston, MA: Orpheum Theater ()
- Bournemouth: O2 Academy ()
- Bristol: O2 Academy ()
- Cologne: Opernhaus ()
- Columbus, OH: Ohio State Fair Grounds ()
- Derby: Odeon ()
- Flagstaff, AZ: Old Post Office ()
- Hamburg: Opernhaus ()
- Kiel: Ostseehalle ()
- Leeds: O2 Wireless Festival ()
- Lewisham: Odeon ()
- London: Oceanic Studios ()
- London: Old Billingsgate Fish Market ()
- London: Olympic Stadium ()
- London: Oval Cricket Ground ()
- Los Angeles, CA: Orpheum Theater ()
- Manchester: Oasis Club ()
- Manchester: Odeon ()
- Munich: Olympiahalle ()
- Naas: Oxygen Festival ()
- Newcastle: Odeon ()
- Oakland, CA: Oracle Arena ()
- Offenburg: Oberrheinhalle ()
- Orlando, FL: Orlando Sports Stadium ()
- Osaka: Osaka Castle Hall ()
- Oslo: Oslo Spektrum ()
- Paris: Open Air ()
- Purley: Orchid Ballroom ()
- Ravenburg: Oberschwabenhalle ()
- Reading: Olympia ()
- Rochester: Odeon ()
- Southend: Odeon Cinema ()
- Southport: Odeon Theatre ()
- Wallingford, CT: Oakdale Theatre ()
- Watford: Odeon ()
Venues
Venues beginning with O