Contrast sensitivity function, relationship of contrast threshold vs angular frequency for an observer
Military
Central Security Forces (CSF), an Egyptian paramilitary force
Comprehensive Soldier Fitness
Coalition Support Fund, US military aid to countries
Thomson-CSF of Thales Group
Education
California Scholarship Federation
California State University, Fullerton, a university in Southern California
Collège de la Sainte Famille, a Jesuit school in Cairo, Egypt
Colorado Shakespeare Festival, a Shakespeare Festival each summer at the University of Colorado at Boulder
College of Santa Fe, a private art centric college in Santa Fe New Mexico
Conseil scolaire francophone de la Colombie-Britannique, a public school board in British Columbia, Canada
Christian Student Fellowship, a Christian campus ministry at the University of Kentucky in Lexington, Kentucky
Curriculum and Standards Framework
Computing
Connected Services Framework, a service aggregation SOA platform from Microsoft
NIST Cybersecurity Framework
Sport
CONMEBOL or CSF (Confederación Sudamericana de Fútbol)
CSF CFR Timișoara, a Romanian amateur association football club
CSF Group-Navigare, an Irish professional cycling team
Other uses
Caesium fluoride (cesium fluoride), a chemical compound
Capsize screening formula
Catholic Secular Forum of Mumbai, India
Commercial Spaceflight Federation, a non-profit trade association of businesses and organizations working to make commercial human spaceflight a reality
Community of St. Francis. an Anglican Order of nuns
Compagnie générale de la télégraphie sans fil, a French telecommunications company
China Securities Finance, a Chinese quasi-central bank for brokerage firms