DDI may stand for:

Companies and organizations

* DD International, international TV channel in India * Development Dimensions International, a talent management company *

Direct Democracy Ireland Direct Democracy Ireland (, ) is a minor political party in Ireland. It has no representation at local or national level. Established in 2010, Direct Democracy Ireland (DDI) was registered as a political party in October 2012. The organisation ...

, a political party in Ireland *

KDDI () is a Japanese telecommunications operator formed on October 1, 2000 through the merger of DDI Corp. (Daini-Denden Inc.), KDD (Kokusai Denshin Denwa) Corp. (itself a former listed state-owned enterprise privatized in 1998), and IDO Corp. It ...

, formerly DDI, a Japanese telecommunications company

Science

Drug–drug interaction Drug interactions occur when a drug's mechanism of action is disturbed by the concomitant administration of substances such as foods, beverages, or other drugs. The cause is often the inhibition of the specific receptors available to the drug, ...

Didanosine Didanosine (ddI, DDI), sold under the brand name Videx, is a medication used to treat HIV/AIDS. It is used in combination with other medications as part of highly active antiretroviral therapy (HAART). It is of the reverse-transcriptase inhibitor ...

, an antiretroviral drug

Technology

* Acronym for DNS/DHCP/IPAM; see IP Address Management * Direct dial-in, or direct inward dialing, a telecommunications service * ''D&D'' Insider, an online method used to deliver ''Dungeons & Dragons'' content *

Diverging diamond interchange A diverging diamond interchange (DDI), also called a double crossover diamond interchange (DCD), is a subset of diamond interchange in which the opposing directions of travel on the non-freeway road cross each other on either side of the inte ...

, a road structure that guides traffic

Other uses

* Dance Dance Immolation, interactive performance piece *

Data Documentation Initiative The Data Documentation Initiative (also known as DDI) is an international standard for describing surveys, questionnaires, statistical data files, and social sciences study-level information. This information is described as metadata by the st ...

, a standard for describing surveys, questionnaires, and statistical data files *

Democracy-Dictatorship Index Democracy-Dictatorship (DD), index of democracy and dictatorship or simply the DD index or the DD datasets refers to the binary measure of democracy and dictatorship first proposed by Adam Przeworski ''et al.'' (2010), and further developed a ...

, a binary measure of democracy and dictatorship *

Divisional detective inspector {{unreferenced, date=October 2008 Divisional detective inspector (DDI), also known as first class detective inspector, was a rank in the Criminal Investigation Department of London's Metropolitan Police, equivalent to sub-divisional inspector in t ...

, a rank in the Criminal Investigation Department of London's police {{disambiguation