DEMOS (meaning "Dialogovaya Edinaya Mobilnaya Operatsionnaya Sistema" (Диалоговая Единая Мобильная Операционная Система, ДЕМОС), or "Interactive Common Portable Operation System") was a Unix-like operating system developed in the Soviet Union. It was derived from BSD Unix.

Demos is an influential left-wing think tank based in the United Kingdom. It was founded in 1993 by journalists from Marxism Today, the theoretical journal of the Communist Party of Great Britain (CPGB). In the run up to the 1997 UK general election it was seen as being close to the Labour Party, in particular the current leader Tony Blair.

Demos: A Network for Ideas & Action is a U.S. based research and policy center that was founded in 2000. According to a wide variety of media reports, Demos has growing influence on the North American debate about election reform and economic security, with a particular emphasis on the development of a broad, stable future middle class in the US.

DEMOS is a visual modeling tool that produces executable code. It is based on a hybrid approach that annotates model elements with Java code snippets. By leaving complex parts at the code level, it achieves executability while keeping the basic modeling language simple.

A term variously used in ancient Greece to describe the citizens, their assemblies, or the lower classes.

Data Enhanced Management Online Support: this project is designed to train managers to use data in decision making to enhance the agency's capability in meeting the national standards in the Children and Family Services Reviews by the federal government.)

An abbreviation for demonstrations.

Individuals who place highest in specific chosen demographic characteristics.