CSG may refer to:
Companies CSG International, an American company providing business support systems and services CSG Limited an Australian ICT company Commodore Semiconductor Group, formerly MOS Technology China Shipping Group, Chinese shipping conglomerate Cloud Software Group, American software conglomerate Czechoslovak Group, a Czech holding company in aviation, railway, defense industry.
Military California State Guard, the state defense force of California Carrier strike group, an operational formation of the US Navy Conseil supérieur de la guerre, French military organization Corps Support Group, a brigade-sized unit in the United States Army
Organizations Camden School for Girls, in London, England Columbus School for Girls, in Ohio, United States Canadian Senators Group, a parliamentary group Centrum Schwule Geschichte (Gay History Center), Cologne, Germany Citizens for Self-Governance, a US political organization Common Sense Group, a UK political organisation Community Security Group, private police force in Australia The Council of State Governments, a United States non-profit organization
Science and technology Coal seam gas, from coal beds Constructive solid geometry, a technique used in solid modeling Constructible strategy game, type of tabletop strategy game Context-sensitive grammar, a formal grammar Crystalline silicon on glass, see Polycrystalline silicon photovoltaics#Novel ideas for polycrystalline silicon Haeco-CSG, an obsolete audio signal processing technology
Other uses csg, the ISO 639 code for the Chilean Sign Language Centre Spatial Guyanais (Guiana Space Centre), near Kourou, a rocket launch site in South America Columbus Airport (Georgia), US, IATA code Commonwealth Secretary-General Contribution sociale généralisée, a tax in France