Publishers - O
| Name | Potter | Year |
|---|---|---|
| Offices of ‘The Studio’ | 75 | 1910 |
| Orpheus Publishing House | 676 | 1921 |
| Osborne Press | 181 | 1902 |
| Osgood & Co., James R. | 200 | 1878 |
| Ouseley, John | 60 | 1909 |
| Outing Publishing Co. | 185 | 1907 |
| Outing Publishing Co. | 1130 | 1907 |
| Oxford University Press | 43 | 1907 |
| Oxford University Press | 399 | 1913 |
| Oxford University Press | 1159 | 1913 |