Sim

Sim or SIM may refer to:

Computing and technology

Scientific Instrument Module, an object used in spacecraft such as in the Apollo Command/Service Module
Security information management, a concept in computer security
Selected ion monitoring, a mass spectrometry scanning mode
Space Interferometry Mission, a proposed NASA space mission
Subscriber Identity Module, a type of data storage for mobile devices
HP Systems Insight Manager, a system management tool

Sim, a character in the Star Trek: Enterprise episode "Similitude"
Sim, a term for the descendants of Homo erectus in the short story collection A Different Flesh by Harry Turtledove

Student Information Management (SIM), a Non-profit Organisation
Serving In Mission (formerly Sudan Interior Mission), a Christian mission organization
Servizio Informazioni Militari, a former Italian military intelligence organization
Servicio de investigación Militar, a former Spanish military intelligence organization.
Singapore Institute of Management
Society for Information Management
Studio for Interrelated Media, an academic concentration at the Massachusetts College of Art