| 4287 | 4211 | Nurse & Co | C Nurse & Co's price list | | WCP | Nurse |
| 4288 | 2310 | O'Brien Thomas & Co Ltd | Mayfair heating stoves | 1947 | WCP | O'Brie |
| 4289 | 6609 | Martin O'Connell | Research volume of the Surrey Archaeological Society No.5 : historic towns in Surrey | 1977 | E/15 | Surrey |
| 4291 | 6604 | M O'Connell | Petters Sports Field, Egham : excavation of a late bronze age/early iron age site | 1986 | E/61.4 | O'Conn |
| 4294 | 3948 | E Russell Oakley | Illustrated guide to, and short history of the Priory Church, Christchurch, Hampshire, England | 1945 | B/26.2 | Hampsh |
| 4295 | 1402 | K P Oakley et al | A survey of the prehistory of the Farnham district (Surrey) | 1939 | E/61.0 | Oakley |
| 4297 | 7547 | Obo | OBO it! | ? | B/05.4 | Obo |
| 4298 | 7045 | Odhams Press Ltd | The home workshop | ? | E/33.0 | Odhams |
| 4301 | 2770 | Basil Oliver | The cottages of England : a review of their types and features from the 16th to the18th centuries | 1929 | B/22 | Oliver |
| 4302 | 3779 | Paul Oliver | The village green | ? | E/15 | UK/OLI |
| 4305 | 6814 | Paul Oliver | English cottages and small farmhouses : a study of vernacular shelter | 1975 | B/01.3 | Oliver |
| 4306 | 5191 | edited by R J Olney | Labouring life on the Lincolnshire Wolds : a study of Binbrook in the mid-nineteenth century | 1975 | E/17.1 | Olney, |
| 4307 | 5461 | O Olsen | Fyrkat, Viking Camp Near Hobro | 1959 | E/61.2 | Olsen, |
| 4311 | 3852 | The Countess of Onslow | Clandon Park | 1952/ | M/08 | Surrey |
| 4312 | 4368 | Peter Orde | Lindisfarne castle | ? | M/08 | Nation |
| 4313 | 3367 | Ordnance Survey | Map of southern Britain in the iron age | 1962 | E/61.5 | Ordnan |
| 4314 | 3354 | Ordnance Survey | Map of Britain in the dark ages from 410 AD to 870 AD | 1966 | E/61.7 | Ordnan |
| 4315 | 5045 | Bernard & Elizabeth Orna | Flint in Norfolk building | 1984 | B/05.4 | Orna, |
| 4316 | 4746 | edited by F J Osborn | Town & country planning | 1952 | E/16.7 | Osborn |
| 4317 | 4745 | edited by F J Osborn | Town & country planning | 1958 | E/16.7 | Osborn |
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