| Commission acronym | Commission |
| CAC | Aperiodic Crystals |
| CBM | Biological Macromolecules |
| CQC | Quantum Crystallography |
| CCGCM | Crystal Growth and Characterization of Materials |
| CCC | Crystallographic Computing |
| CCT | Crystallographic Teaching |
| CCACH | Crystallography in Art and Cultural Heritage |
| CCM | Crystallography of Materials |
| CEC | Electron Crystallography |
| CHP | High Pressure |
| CIMS | Inorganic and Mineral Structures |
| CMS | Magnetic Structures |
| CMTC | Mathematical and Theoretical Crystallography |
| CNS | Neutron Scattering |
| CNMR | NMR Crystallography and Related Methods |
| CPD | Powder Diffraction |
| CSAS | Small-angle scattering |
| CSC | Structural Chemistry |
| Csynr | Synchrotron and XFEL Radiation |
| CXAFS | XAFS |
| CommDat | Data |