ICS may refer to:

• Image Cytometry Standard, a digital multidimensional image file format used in life sciences microscopy
• Industrial control system, computer systems and networks used to control industrial plants and infrastructures
• Information and computer science, the combined field of informatics and computing
• Internet chess server, an external server that provides the facility to play, discuss, and view chess over the Internet
• Internet Connection Sharing, a feature in Microsoft operating systems since the advent of Windows 98 Second Edition
• .ics, a filename extension for iCalendar files
• Android Ice Cream Sandwich, the codename for version 4.0 of the Android operating system

• Donald Bren School of Information and Computer Sciences, Irvine, California, United States
• Graduate School of International Corporate Strategy, Tokyo, Japan
• Indian Central School, Singapore
• Institute for Christian Studies, Toronto, Ontario
• Institute of Classical Studies, University of London, UK
• Institute of Cornish Studies, in Falmouth, UK
• Inter-Community School Zürich, Switzerland
• Intermountain Christian School, Utah, United States
• International Christian School (Hong Kong)
• International Community School (Kirkland, Washington)
• International Community School (Singapore)
• International Community School (Thailand)
• International Community School (UK)
• International Community School of Addis Ababa
• International Correspondence Schools
• Islesboro Central School

• International Channel Shanghai, a foreign-language cable channel
• Immigration And Customs Security, a fictional organization in the Canadian TV series The Border

• ICS Vortex, alias of Simen Hestnæs, Norwegian rock musician
• Immersion Composition Society, a network of composers, based in the USA

• Inhaled corticosteroid, steroid hormones used to treat the nasal mucosa, sinuses, bronchi, and lungs
• Intercostal space, the space between two ribs

• ICS Africa
• Imperial Civil Service
• Indian Civil Service
• Indian National Congress (Socialist)
• Institute of Chartered Shipbrokers
• Institute for Computational Sustainability, a Cornell-based institute in the United States
• International Chamber of Shipping
• International Citizen Service, a UK volunteer organization
• International Commission on Stratigraphy, the largest scientific body within the International Union of Geological Sciences
• International Communist Seminar
• International Continence Society, a multidisciplinary membership society for medical professionals concerned with incontinence
• Irish Computer Society, the national body for Information and Communication Technology (ICT) Professionals in Ireland
• Integrated care system, a component of the National Health Service (England)

• Ganz CSMG, also known as Ganz ICS, a Hungarian tram type
• In Channel Select, a technology improving programme reception in FM tuners
• Industrial control system
• International Classification for Standards, an international classification system for technical standards
• International Code of Signals, a maritime signaling standard also abbreviated INTERCO

• Incident Command System, an emergency response management system
• InterCity Slovenia, a premium train service in Slovenia
• Israeli Cassini Soldner, a historical geographic coordinate system
• Investor court system
• Inmate Calling Service, a type of specialized telephone service provisioned for use by inmates at correctional facilities
• Iconsiam, a mixed-use development in Thailand

• Ic (disambiguation)