DDI may stand for: Companies and organizations DD International, international TV channel in India Development Dimensions International, a talent management company Direct Democracy Ireland, a political party in Ireland KDDI, formerly DDI, a Japanese telecommunications company Science Drug–drug interaction Didanosine, 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 road structure that guides traffic Other uses Dance Dance Immolation, interactive performance piece Data Documentation Initiative, a standard for describing surveys, questionnaires, and statistical data files Democracy-Dictatorship Index, a binary measure of democracy and dictatorship Divisional detective inspector, a rank in the Criminal Investigation Department of London's police