| isolated case | caso aislado |
| Isolated pawn | Peón pasado |
| Isolated sytem | Sistema cerrado |
| isolation | aislamiento |
| isolationism | aislacionismo |
| Isole di Brissago | Jardín Botánico de la isla de Brissago |
| Isomaltase | Isomaltasa |
| isomer | isómero |
| Isometric projection | Proyección isométrica |
| Isomorphism class | Clase de isomorfismo |
| Isona i Conca Dellà | Isona |
| Isone | Isone |
| Isoperimetry | Isoperimetría |
| Isophotes | Isofota |
| Isopoda | Isopoda |
| Isopods | Isopoda |
| Isoprene | Isopreno |
| Isorno | Isorno |
| Isoroku Yamamoto | Isoroku Yamamoto |
| isosceles | isósceles |
| Isospin | Isospín |
| Isosporiasis | Isosporiasis |
| Isostasy | Isostasia |
| isotherm | isoterma |
| Isothermal process | Proceso isotérmico |
| Isotone | Isotónico |
| isotope | isótopo |
| Isotope geochemistry | Geoquímica de isótopos |
| Isotope separation | Enriquecimiento de uranio |
| Isotope table | Tabla de los isótopos |
| Isotopic abundance | Abundancia natural |
| Isotopic composition | Composición isotópica |
| Isotopic separation | Enriquecimiento de uranio |
| Isotretinoin | Isotretinoína |
| Isozyme | Isoenzima |
| ISP | proveedor de servicios de Internet |
| Isparta | Provincia de Isparta |
| Isparta Province | Provincia de Isparta |
| Ispaster | Ispáster |
| ISPF | ISPF |
| Ispica | Ispica |
| Israel | Israel |
| Israel Adrián Caetano | Adrián Caetano |
| Israel Aerospace Industries | Israel Aerospace Industries |
| Israel Border Police | Policía de Fronteras de Israel |
| Israel Central Bureau of Statistics | Oficina Central de Estadísticas de Israel |
| Israel Defense Forces | Fuerzas de Defensa Israelíes |
| Israel Defense Forces attack Gaza Strip | Israel invade la Franja de Gaza |
| Israel Football Association | Asociación de Fútbol de Israel |
| Israel invades Gaza Strip | Israel invade la Franja de Gaza |
| Israel Museum | Museo de Israel |
| Israel national football team | Selección de fútbol de Israel |
| Israel Philharmonic Orchestra | Orquesta Filarmónica de Israel |
| Israel State Cup | Copa de Israel |
| Israel Tal | Israel Tal |
| Israel Zolli | Eugenio Zolli |
| Israel-Egypt Peace Treaty | Tratado de paz israelo-egipcio |
| Israel-Jordan Treaty of Peace | Tratado de paz jordano-israelí |
| Israeli | israelita |
| Israeli agora | Ágora |
| Israeli Air Force | Fuerza Aérea Israelí |
| Israeli court orders controversial wall rerouted | La Corte Suprema de Israel ordena cambiar el trazado del muro de seguridad |
| Israeli Intelligence Community | Agencias de Inteligencia de Israel |
| Israeli new sheqel | Nuevo shéquel |
| Israeli PM Sharon rushed to hospital | Ariel Sharón se debate entre la vida y la muerte |
| Israeli Security Forces | Fuerzas de Seguridad de Israel |
| Israeli settlement | Asentamiento israelí |
| Israeli Space Agency | Agencia Espacial de Israel |
| Israeli West Bank barrier | Barrera israelí de Cisjordania |
| Israeli wine | Israel |
| Israeli-Palestinian conflict | Conflicto árabe-israelí |
| Israelian | israelí |
| Israelite | israelita |
| Israelites | Tribus de Israel |
| Israir Airlines | Israir |
| Issachar | Isacar |
| Isshin-ryū | Isshin-ryū |
| issue | asunto |
| issue from | emanar de |
| issued | emitido |
| issues | problemas |
| issuing | emisor |
| Issus | Issos |
| Issyk Kul | Issyk-Kul |
| Issyk Kul Province | Provincia de Ysyk-Kol |
| Issyk-Kul | Issyk-Kul |
| Istakhr | Istakhr |
| Istanbul | Estambul |
| Istanbul Park | Circuito de Estambul |
| Istanbul Province | Provincia de Estambul |
| Istanbul Technical University | Universidad Politécnica Estambul |
| Istanbul University | Universidad de Estambul |
| Istari | Istari |
| Isthmian Games | Juegos Ístmicos |
| isthmus | istmo |
| Isthmus of Corinth | Istmo de Corinto |
| Isthmus of Ofqui | Istmo de Ofqui |
| Isthmus of Panama | Istmo de Panamá |
| Isthmus of Tehuantepec | Istmo de Tehuantepec |
| İstiklal Marşı | İstiklâl Marşı |
| İstiklâl Marşı | İstiklâl Marşı |
| Istiqlal Party | Partido Istiqlal |
| Istituto Nazionale di Statistica | Istituto Nazionale di Statistica |
| Istituto per la Ricostruzione Industriale | Istituto per la Ricostruzione Industriale |
| Istok | Este |
| Istria | Istria |
| Istria County | Istria |
| Istriot language | Idioma istrioto |
| István Széchenyi | Széchenyi István |
| István Tisza | István Tisza |
| Isuzu | Isuzu |
| Isère | Isère |
| Isère River | Río Isère |
| Isérables | Isérables |
| it | la |
| It depends | Según y como |
| it doesn't make any difference to me | me da igual |
| It doesn´t matter | No es grave |
| It Happened One Night | Sucedió una noche |
