| irreversibility of the phenomenon | fænomenets irreversibilitet |
| irrigation | kunstvanding |
| Irrigation channel | Kanal |
| irrigation farming | landbrug med kunstig vanding |
| irrigation system | vandingsanlæg |
| Irvin McDowell | Irvin McDowell |
| Irvine | Irvine |
| Irving Berlin | Irving Berlin |
| is | er |
| Is This It | Is This It |
| Isaac Albéniz | Isaac Albéniz |
| Isaac Asimov | Isaac Asimov |
| Isaac Newton | Isaac Newton |
| Isabel | Isabella |
| Isabel Allende | Isabel Allende |
| Isabel Allende Bussi | Isabel Allende |
| Isabel Province | Isabella |
| Isabella | Isabella |
| Isabella of Austria | Elizabeth af Habsburg |
| Isabella of France | Isabella |
| Isabelle | Bell |
| Isabelle Adjani | Isabelle Adjani |
| Isabelle of Hainaut | Isabella af Hainaut |
| Isabelle theorem prover | Isabella |
| Isadora Duncan | Isadora Duncan |
| Isaiah Berlin | Isaiah Berlin |
| Isang Yun | Isang Yun |
| Isao Takahata | Isao Takahata |
| Isar | Isère |
| Isarco River | Isarco |
| Ischaemic heart disease | Angina pectoris |
| Ischia | Ischia |
| ISCSI | ISCSI |
| Isentropic process | Isentropisk proces |
| Iseo | Tristan og Isolde |
| Iserlohn | Iserlohn |
| Isernhagen | Isernhagen |
| Isfahan | Isfahan |
| Isfahan Province | Isfahan |
| Ishmael | Ismael |
| Ishtar | Ishtar |
| Ishøj | Ishøj Kommune |
| Isildur | Isildur |
| Isis | Isis |
| Isla Aves | Fugl |
| Isla de Aves | Fugl |
| Isla de los Estados | Isla de los Estados |
| Isla Fisher | Isla Lang Fisher |
| Isla Grande de Tierra del Fuego | Ildlandet |
| Isla Perejil | Persilleøen |
| Isla Sorna | Isla Sorna |
| Islam | islam |
| Islam in Bulgaria | Islam i Bulgarien |
| Islamabad | Islamabad |
| Islamic | Islam |
| Islamic art | Islamisk kunst |
| Islamic calendar | Islamisk kalender |
| Islamic Courts Union | Rådet af Islamiske Domstole |
| Islamic Republic of Iran | Iran |
| Islamic Republic of Mauritania | Mauretanien |
| Islamic Republic of Pakistan | Pakistan |
| Islamic view of Aaron | Aron |
| Islamic view of Abraham | Abraham |
| Islamic view of Adam | Adam |
| Islamic view of Ishmael | Ismael |
| Islamic view of Lot | Lot |
| Islamic view of Moses | Moses |
| Islamic view of Noah | Noa |
| Islamic view of Solomon | Kong Salomon |
| Islamism | Islamisme |
| Islamitic | Islam |
| Islamophobia | islamofobi |
| island ecosystem | en øs økosystem |
| Island of California | Californien |
| Island of Mozambique | Mozambique |
| Islands Brygge station | Islands Brygge Station |
| Isle of Arran | Arran |
| Isle of Balar | Balarbugten |
| Isle of Man | Isle of Man |
| Isle of Mann | Isle of Man |
| Isle of Skye | Skye |
| Isle of Wight | Isle of Wight |
| Isles of Scilly | Isles of Scilly |
| Islote Horacio | Horats |
| ISM band | ISM-bånd |
| Ismail Haniyeh | Ismail Haniyeh |
| Ismail Kadare | Ismail Kadaré |
| İsmet İnönü | Ismet Inönü |
| ISO | ISO |
| ISO image | ISO-fil |
| Iso Rivolta | ISO |
| ISO standard | ISO-norm |
| Isochoric process | Isochor |
| Isoelectric point | Isoelektrisk punkt |
| isomer | isomer |
| Isonoe | Isonoe |
| Isoprene | Isopren |
| Isoroku Yamamoto | Isoroku Yamamoto |
| Isortoq | Isortoq |
| Isothermal process | Isoterm |
| isotope | isotop |
