| Istituto Italiano di Cultura | |
| Istituto per l'Oriente | |
| Istituto superiore di pedagogia | |
| Itacalibri | |
| Italian book company | |
| ITER | |
| Izdatel' V. P. Poljakov [Издатель В. П. Поляков] | |
| Iðunn | |
| J. Martyn | |
| J. Nourse | |
| J. Nourse | |
| J. Pote also for J. Hodges, and John & James Rivington | |
| J. Robert, J. Pemberton | |
| J. Walthoe, R. Wilkin, J. & J. Bonwicke, S. Birt, T. Ward, and T. Osborne | |
| J. Weale | |
| J. Wyat, S. Ballard, J. Noon | |
| J.M. Dent and Sons | |
| Jacopo Carlieri | |
| Jacopo Marsigli | |
| Jacopo Vallarsi | |
