| Iapigia | Iapigia: organo della Deputazione di Storia patria per le Puglie | Bari |
| Iaz. Lit. | Iazyk i Literatura. | Leningrad |
| Id. Val. | Ideas y Valores: revista de la Fac. de Filosofía y Letras. | Bogotá, Colombia |
| Illin. Class. St. | Illinois Classical Studies. | Urbana & Chicago, Ill. |
| Illustr. Lond. News | Illustrated London News. | London |
| Illustr. Vat. | Illustrazione Vaticana. | Città del Vaticano |
| Illustration | Illustration. | Paris |
| Imago | Imago. | Wien |
| Inc. Ling. | Incontri linguistici | Pisa |
| Index | Index: quaderni camerti di studi romanistici. | Napoli |
| Indoger. Chr. | Indogermanische Chronik | - |
| Indogerm. Forsch. | Indogermanische Forschungen. | Berlin |
| Indogerm. Jahr. | Indogermanisches Jahrbuch. | Berlin |
| Inform. Gram. | Information grammaticale. | Paris |
| Inform. Hist. | Information historique. | Paris |
| Inform. Hist. Art | Information d'Histoire de l'Art. | Paris |
| Inform. Litt. | Information littéraire. | Paris |
| Inoz. Filol. | Inozemna filolohija (Philologie étrangère). | Lwów |
| Int. Ar. Ethn. | International Archiv für Ethnographie. | Leiden |
| Int. Bibl. Hist. Sc. | International Bibliography of Historical Sciences. | Washington |
| Inter. Philos. Quart. | International Philosophical Quarterly. | Bronx, N. Y. |
| Intern. Guid. Class. St. | International Guide to Classical Studies. | Darien, Conn. |
| Intern. Guid. Med. St. | International Guide to Medieval Studies. | Darien, Conn. |
| Intern. Journ. Class. Trad. | International journal of the classical tradition. | New Brunswick, N.J. |
| Intern. Journ. Mus. | International journal of musicology. | Frankfurt/Main |
| Intern. Journ. Naut. Arch. Underw. Expl. | International Journal of Nautical Archaeology and Underwater Exploration. | London |
| Intern. Journ. Philos. St. | International journal of philosophical studies. | Andover (U.K.) |
| Intern. Kirch. Zeit. | Internationale Kirchliche Zeitung. | Bern |
| Intern. Mon. Schr. | International Monatsschrift. | Berlin |
| Intern. St. Philos. | International Studies in Philosophy | Torino |
| Interpretation | Interpretation: a journal of political philosophy. | Flushing, N. Y. |
| Invig. Luc. | Invigilata lucernis: rivista dell'Istituto di Latino. | Bari |
| Ir. Ant. | Iranica antiqua. | Leiden |
| Ir. Jur. | Irish Jurist. | Dublin |
| Iran | Iran: journal of the British Institute of Persian Studies. | London |
| Iraq | Iraq, published by the British School of Archaeology in Iraq. | London |
| Isis | Isis: international review devoted to the history of science and its cultural influences. | Washington, D. C. |
| Isr. Expl. Journ. | Israel Exploration Journal. | Jerusalem |
| Istanb. Asar. Muz. | Istanbul Asariatika Muzeleri Nesriyati (Annuaire des Musées d'antiquités). | Istanbul |
| Istanb. Forsch. Deut. Arch. Inst. | Istanbuler Forschungen des Dt. Archäol. Inst. | Berlin |
| Istor. Filos. Ezeg. | Istoriko-filosofsky ezegodnik (History of philosophy yearbook), | Moszcow |
| Istor. Zap. | Istoricheskie Zapiski (Mémoires historiques). | Moszcow |
| Istros | Istros: revue roumaine d'archéologie et d'histoire ancienne. | Bucarest |
| It. Ant. | Italia antichissima. | Reggio Calabria |
| It. che scr. | Italia che scrive: rassegna critica-bibliografica. | Roma |
| It. Dial. | Italia Dialettale. | Pisa |
| It. Med. Uman. | Italia medioevale ed umanistica. | Padova |
| Ítaca | Ítaca: quaderns catalans de cultura clàssica. | Barcelona |
| Italica (Ann Arbor) | Italica: review of the American Assoc. of teachers of Italian. | Ann Arbor, Univ. of Michigan |
| Italica (Madrid) | Italica: cuadernos de trabajos de la Escuela española de historia y arqueología en Roma. | Madrid |
| Iul. Dert. | Iulia Dertona. | Tortona |
| Iura | Iura: rivista internazionale di diritto romano ed antico. | Napoli |