DCI may be an abbreviation for:
Technology
- D-chiro-inositol, an isomer of inositol
- Data, context and interaction, an architectural pattern in computer software development
- Direct Count & Intersect, an algorithm for discovering frequent sets in large databases
- Digitally controlled impedance, impedance control function in FPGA
- Display Control Interface, a standard developed by Microsoft and Intel using code from San Francisco Canyon Company for device drivers that control computer graphics cards
- Distributed Computing Infrastructure, a term used in grid computing referring to the combination of distributed computer resources
- Ductile cast iron, another name for ductile iron, a more flexible type of cast iron
- dCi (direct Common-rail Injection), Renault/Nissan's common rail fuel injection technology for diesel engines
- Data Center Interconnect, (DCI) is a network that connects two or more Data Centers together to transport traffic between them
Businesses
- Digital Cinema Initiatives, a joint venture between the major Hollywood studios to establish a specification for a standard digital cinema architecture
- Discovery Communications, an American global media and entertainment company
- Dynamic Cassette International, a Boston, Lincolnshire, UK company that produces products under the Jet Tec brand name
- DCI Cheese Company
- Dolphin Capital Investors, a real estate investment company focusing on the residential resort sector in emerging markets, and listed on the Alternative Investment Market (AIM) of the London Stock Exchange
- Diners Club International, a global charge card
Organizations
- DCI (Wizards of the Coast) (formerly known as Duelists' Convocation International), the organization that sanctions official tournaments of Wizards of the Coast games, most notably Magic: The Gathering
- Defence for Children International, an independent non-governmental organisation that operates globally to promote and protect children's rights
- Dental Council of India, an organisation which regulates dental education in India
- Dialysis Clinic, Inc, a nonprofit medical organization headquartered in Nashville, Tennessee
- Drum Corps International, the nonprofit organization governing modern junior drum and bugle corps
- DCI Global Partnerships, the community and work associated with DCI Trust—a UK charity committed to mobilising Christian leaders, providing micro-loans for the economically poor, networking a global Christian constituency and giving to bless the poor of the earth
- Distressed Children & Infants International, a nonprofit organization serving disadvantaged children in South Asia
Other
- Dade Correctional Institution, a prison in Florida
- Development Cooperation Instrument
- Director of Central Intelligence, the former title of the head of the U.S. Intelligence Community and Central Intelligence Agency
- Detective chief inspector, a police rank in the United Kingdom
- Decompression illness, a medical condition brought on by rapid decompression
- Doctor of Creative Industries, a qualification awarded by Queensland University of Technology
- Defence Capabilities Initiative, a 1999 NATO plan to ensure the effectiveness of multinational operations with a focus on improving interoperability among Alliance forces
- DCI, the number 601 in Roman numerals
- District of Columbia International School