| Oaklands School | York, Yorkshire |
| Oakmead School | Bournemouth, Dorset |
| Oakmeeds Community College | Burgess Hill, Sussex |
| Oakwood School | Rotherham, South Yorkshire |
| Oakwood Park Grammar School | Maidstone, Kent |
| Oakwood Secondary School | Horley, Surrey |
| Oathall School | Haywards Heath, West Sussex |
| Offerton High School | Stockport, Lancashire |
| Old Buckenham School | Thetford, Norfolk |
| Old Palace School | Croydon, London |
| Oldbury Wells School | Bridgnorth, Shropshire |
| Omagh Catholic Boys' School | Omagh, Northern Island |
| Ordsall School | Retford, Derbyshire |
| Orleton Park School | Telford, Shropshire |
| Oundle School | Oundle, Northamptonshire |
| Our Lady's and St.Bede's School | Stockton, Lancs |
| Our Lady's Convent School | London |
| Our Lady's High School | Oldham, Lancashire |
| Our Lady of Lourdes | Ballymoney, N.Ireland |
| Our Lady of Sion School | Worthing, East Sussex |
| Our Lady's School | Oldham, Lancashire |
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| Our Lady's High School | Cumbernauld, Strathclyde |
| Our Lady's High School | Manchester, Greater Manchester |
| Our Lady's High School | Preston, Lancs |
| Ousedale School | Newport Pagnell, Bucks. |
| Ovingham Middle School | Prudhoe, Northumberland |
| Oxford High School | Oxford, Oxfordshire |
| Oxted School | Oxted, Surrey |
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