Oake Manor Golf Club Ltd (Golf Club, 2 gigs, Oake)
Oakland Hotel, The (Hotel, 1 gig, South Woodham Ferrers)
Okehampton Conservative Club (Other, 1 gig, Okehampton)
Old Anchor Inn, The (Live Music Pub, 10 gigs, Abingdon-on-Thames)
Old Barn Club, The (Club, 1 gig, Yeovil)
Old Barn Inn (Pub / Restaurant, 1 gig, Bickington)
Old Dean Bowling Club (Other, 1 gig, Camberley)
Old House At Home, The (Pub, 2 gigs, Milton)
Old Oak, The (Pub, 1 gig, Arlesey)
Old Riverport Jazz & Blues Festival (Festival, 1 gig, St Ives)
Old Sergeant, The (Live Music Pub, 1 gig, Wandsworth)
Old Ship Aground, The (Inn / Restaurant, 5 gigs, Minehead)
Old Smithy, The (Pub, 1 gig, Ivybridge)
Old Ticket Hall (Pub, 18 gigs, Windsor)
Old Transporter Ale House, The (Pub, 1 gig, Henlow)
Old Wainhouse Inn, The (Pub & Food Bar, 1 gig, Wainhouse Corner)
Oliver Cromwell (Other, 1 gig, St Ives)
Online (Festival, 1 gig, St Albans)
Ostler Inn (Pub / Hotel, 2 gigs, Uffculme)
Ouse Valley River Club (Private Members' Club, 1 gig, Little Paxton)
Total 20