UCS may refer to:

Educational institutions

• University College School, a British independent school situated in Hampstead, north west London
• University Campus Suffolk, former name of a university based in Ipswich, Suffolk, United Kingdom
• University of Caxias do Sul, a university in Brazil

Technology

• Cisco Unified Computing System, a computing server product line
• Uniform Communication Standard, an electronic commerce standard
• Uniform-cost search, an algorithm used to search a weighted graph
• Univention Corporate Server, an operating and management system for IT infrastructure
• Universal Character Set, a standard for character encoding
• Universal Character Set feature for impact printers
• Universal Charging Solution, a proposed standard for cell phone chargers
• Uniform color space, a type of mathematical color model

Other

• Civic Solidarity Union, a political party in Bolivia
• Uniform Color Scales, a color space developed by the Optical Society of America
• Union of Concerned Scientists, a nonprofit advocacy organisation
• United Cigar Stores, an American tobacconist chain of the early 20th century
• United Communication Service, the largest cable operator in Bangladesh
• Universal City Studios, an American film studio, and a subsidiary of NBCUniversal
• Upper Clyde Shipbuilders, a now defunct amalgamation of shipbuilders of the River Clyde, Glasgow, Scotland
• Judiciary of New York or Unified Court System, of the State of New York
• Ultimate Collectors Series, a section of the Lego Star Wars range