III

III or iii may refer to:

Companies

 * Information International, Inc., a computer technology company
 * Innovative Interfaces, Inc., a library-software company
 * 3i, formerly Investors in Industry, a British investment company

Other uses

 * Institute for Information Industry, research institute in Taiwan
 * Insurance Information Institute, a US industry organization
 * Insurance Institute of India, an Indian organisation for training
 * Intelligence and Information Institute, a fictional US government organization in the comic version of Transformers
 * Interactive Investor International
 * Interstate Identification Index, an index of criminal records maintained by the FBI