| Acronym | Meaning |
 | CPPCC | Chinese People's Political Consultative Conference |
 | CPR | Canadian Pacific Railway - CardioPulmonary Resuscitation |
 | CPSM | Continuous Phase Shift Modulation |
 | CPSU | Communist Party Of The Soviet Union |
 | CPT | Contingency Planning Team |
 | CPU | Central Processing Unit |
 | CPV | Cape Verde (ISO 3166 Trigram) |
 | CPX | Command Post EXercise |
 | CQ | Carrier Qualification - Central Queensland - Charge Of Quarters - Congressional Quarterly - Constellation Airlines (IATA Airline Designator) - Northern Mariana Islands (FIPS 10-4 Territory Code) |
 | CQD | Close Quarters Drill (Morse Distress Code Preceding SOS: CQ Calling All Stations |
 | CR | Chrome |
 | CR | Coral Sea Islands (FIPS 10-4 Territory Code) - Costa Rica (ISO 3166 Digram) |
 | CR | Cree Language (ISO 639-1 Code) |
 | CRAM | Combined Radiometric Correction Model |
 | CRC | Central RTI Component - Chemical Rubber Company - Christian Reformed Church - Control And Reporting Centre -Costa Rican Col›n (ISO 4217 Currency Code) -Cyclic Redundancy Check |
 | CRD | Capstone Requirements Document |
 | CRE | Cree Language (ISO 639-2 Code) |
 | CREB | Cyclic AMP-response Element Binding (protein) |
 | CREEP | Committee To Re-Elect The President |
 | CRI | Costa Rica (ISO 3166 Trigram) |
 | CRIPL | Consolidated Remain-In-Place List |
 | CRM | Cardiac Rhythm Management - Customer Relationship Management |
 | CRP | Committee To Re-elect The President - Control And Reporting Post |
 | CRT | Cardiac Resynchronization Therapy - Cathode Ray Tube - Chinese Remainder Theorem |
 | CRTC | Canadian Radio-television And Telecommunications Commission |
 | CS | Combat Support - Computer Scientist -Costa Rica (FIPS 10-4 Country Code) - Serbia And Montenegro (ISO 3166 Digram) |
 | CS | Caesium |
 | CS | Czech Language (ISO 639-1 Code) |
 | CSA | Canadian Space Agency - Canadian Standards Association - Child Support Agency - Command Staff Advisor - Community-supported Agriculture - Confederate States Of America - Corps Storage Area -Czech Airlines |
 | CSAR | Combat Search And Rescue (seessar) |
 | CSC | Closed Spacelike Curve (relativity) - Computer Security Centre |
 | CSEAL | Combat Systems Engineering And Analysis Laboratory (see-seal) |
 | CSERIAC | (U.S. DoD) Crew Systems Ergonomics Information Analysis Center |
 | CSG | Corps Support Group |
 | CSI | See Entry |
 | CSICOP | Committee For The Scientific Investigation Of Claims Of The Paranormal (became The Committee For Skeptical Inquiry In 2006) |
 | CSIP | Commercial Stable Image Platform (AMD) |
 | CSIS | Canadian Security Intelligence Service (seessiss) -(U.S.) Center For Strategic & International Studies |
 | CSK | Czechoslovakia (ISO 3166 Trigram; Obsolete Since 1993) |
 | CSL | U.K. Central Science Laboratory |
 | CSPI | Center For Science In The Public Interest |
 | CSR | Control Supply Rate |
 | CSRC | Conflict Studies Research Centre |
 | CSRF | Cross-Site Request Forgery |
 | CSS | Cascading Style Sheets - Catalina Sky Survey - Central Security Service - Combat Service Support - Confederate States Ship - Content-scrambling System - Cross-site Scripting |
 | CSSCS | Combat Service Support Control System |
 | CST | Central Standard Time (UTC-6 Hours) |
 | CT | Canton And Enderbury Islands (ISO 3166 Digram; Merged Into KI In 1984) - Central African Republic (FIPS 10-4 Country Code) - Connecticut (postal Symbol) |
 | CTBT | Comprehensive [Nuclear] Test Ban Treaty |
 | CTC | Closed Timelike Curve (relativity) - (U.S.) Combat Training Center |