| Isaac Mendez | Isaac Mendez |
| Isaac Newton | Isaac Newton |
| Isaac of Dalmatia | Isacco di Dalmazia |
| Isaac René Guy le Chapelier | Isaac René Guy Le Chapelier |
| Isaba | Isaba |
| Isabel | Isabella |
| Isabel Allende | Isabel Allende |
| Isabel Allende Bussi | Isabel Allende |
| Isabel Martínez de Perón | Isabel Martínez de Perón |
| Isabel of Majorca | Elisabetta di Maiorca |
| Isabel of Portugal | Isabella del Portogallo |
| Isabel Province | Isabella |
| Isabela | Isabela |
| Isabela City | Isabela |
| Isabela Island | Isabela |
| Isabella | Isabella |
| Isabella Colbran | Isabella Colbran |
| Isabella II of Spain | Isabella II di Spagna |
| Isabella Jagiełło | Isabella Jagiełło |
| Isabella Maria of Parma | Isabella Borbone di Parma |
| Isabella of Castile | Isabella di Castiglia |
| Isabella of France | Isabella |
| Isabella of Jerusalem | Isabella di Castiglia |
| Isabella of Portugal | Isabella del Portogallo |
| Isabella of Taranto | Isabella di Chiaromonte |
| Isabella Rossellini | Isabella Rossellini |
| Isabella Stewart Gardner Museum | Isabella Stewart Gardner Museum |
| Isabelle Adjani | Isabelle Adjani |
| Isabelle Huppert | Isabelle Huppert |
| Isabelle theorem prover | Isabella |
| Isadora Duncan | Isadora Duncan |
| Isah Eliakwu | Abdulahi Isah Eliakwu |
| Isaiah | Isaia |
| Isaiah Berlin | Isaiah Berlin |
| Isaiah Osbourne | Isaiah Osbourne |
| Isaias Afewerki | Isaias Afewerki |
| ISAM | ISAM |
| Isambard Kingdom Brunel | Isambard Kingdom Brunel |
| Isan | Thailandia del Nordest |
| Isan language | Thailandia del Nordest |
| Isanosaurus | Isanosaurus attavipachi |
| Isao Takahata | Isao Takahata |
| ISAP | ISAP |
| ISAPI | ISAPI |
| Isar | Isar |
| Isarco River | Isarco |
| Isauria | Isauria |
| Isaz | ISA |
| ischaemia | anemia localizzata |
| ischemia | anemia localizzata |
| Ischgl | Ischgl |
| Ischia | Ischia |
| Ischigualasto | Ischigualasto |
| ISDN Digital Subscriber Line | IDSL |
| Ise class battleship | Ise |
| Ise Province | Ise |
| Ise Shrine | Santuario di Ise |
| Iselle | Iselle |
| Iseltwald | Iseltwald |
| Isembart | Isembardo di Barcellona |
| Isen | Isen |
| Isenburg | Isenburg |
| Isenburg-Philippseich | Isenburg-Philippseich |
| Isengard | Isengard |
| Isenheim Altarpiece | Altare di Isenheim |
| Isenthal | Isenthal |
| Iseo | Iseo |
| Iserlohn | Iserlohn |
| Isernia | Isernia |
| Isfahan | Esfahan |
| Isfahan Province | Esfahan |
| Isfara | Isfara |
| Isfjord | Isfjorden |
| Ishaqi incident | Massacro di Ishaqi |
| Ishida Mitsunari | Ishida Mitsunari |
| Ishikari Province | Ishikari |
| Ishikari River | Ishikari |
| Ishikawa | Prefettura di Ishikawa |
| Ishikawa Prefecture | Prefettura di Ishikawa |
| Ishim | Išim |
| Ishim River | Išim |
| Ishimbay | Isimbaj |
| Ishirō Honda | Ishiro Honda |
| Ishmael | Ismaele |
| Ishtar | Ishtar |
| Ishtar Terra | Ishtar Terra |
| Ishvara | Ishvara |
| Ishøj | Ishøj |
| Isidor Isaac Rabi | Isidor Isaac Rabi |
| Isidore | Isidoro |
| Isidore Geoffroy Saint-Hilaire | Isidore Geoffroy Saint-Hilaire |
| Isidore of Alexandria | Isidoro |
| Isidore of Kiev | Isidoro di Kiev |
| Isidore of Miletus | Isidoro di Mileto |
| Isidro Cardinal Goma y Tomas | Isidro Gomá y Tomás |
| ISight | ISight |
| Isildur | Isildur |
| ISimangaliso Wetland Park | Greater St Lucia Wetland Park |
| Isin | Isin |
| isinglass | colla di pesce |
| Isis | Iside |
| Isisaurus | Isisaurus colberti |
| Iskar | Iskăr |
| İskenderun | Alessandretta |
| Iskitim | Iskitim |
| Isla Aves | Aves |
| Isla de Alborán | Alborán |
| Isla de Aves | Aves |
| Isla Grande de Tierra del Fuego | Terra del Fuoco |
| Isla Margarita | Margarita |
| Isla Martín García | Martín García |
