USI

USI or Usi may stand for:

Organizations

 * USI Tech, a suspected ponzi scheme
 * USI Wireless, a Minnesota internet service provider
 * Union of Independent Trade Unions (Portugal)
 * Union of Students in Ireland, the representative body for students' unions in Ireland
 * Unione Sindacale Italiana, an Italian trade union
 * Union Solidarity International (USi), an international labour organising support organisation
 * Unlimited Software Inc., see Distinctive Software

Places

 * Usı, Tatarstan, a place in Russia
 * Usi County, a county in westernmost Chagang province, North Korea
 * United States of Indonesia, a state in Southeast Asia from 1949 to 1950
 * University of Southern Indiana, a University located in Evansville, Indiana, United States
 * University of Siegen, a University located in Siegen, North Rhine-Westphalia, Germany
 * Università della Svizzera italiana, the University of Italian-speaking Switzerland

Other uses

 * Usi (food), a starch dish of the Urhobo people of Nigeria
 * Uši, an album by Czech band Uz jsme doma
 * User System Interaction, a postgraduate engineering design program in the Netherlands
 * Unique Student Identifier, a unique identifier for all students in Australia
 * Unique Swap Identifier, see Unique Transaction Identifier, identifier for trades mandated by financial markets regulation
 * Universal Stylus Initiative for interoperable active pen styluses for touchscreen devices
 * USI: Under Special Investigation, 2010 TV series