| CDB | Command Descriptor Block | For SCSI commands |
| checked build | | Nonoptimized debug build of a driver or Windows, with debug symbols |
| CIM | Common Information Model | WBEM model for WMI |
| CIMOM | CIM Object Manager | |
| CMIP | Common Management Information Protocol | |
| COM | Common Object Model | |
| Composite device | | A USB device with more than one interface |
| Compound device | | A piece of USB hardware with several internal USB devices |
| Configuration | | A set of interfaces in a USB device |
| Control | A USB data transfer type for small blocks of data | |
DATA0, DATA1 | USB Data packet IDs | |
| DC | Direct Current | |
| DDC | Display Data Channel | Monitor/video channel enumeration |
| DDK | Driver Development Kit | |
| DDI | Device Driver Interface | |
| DebugPrint | | PHD driver trace tool |
| default pipe | | A flow of data to USB Endpoint 0 |
| DIP | Dual In-line Package | |
| DIRQL | Device Interrupt Request Level | |
| DLL | Dynamic Link Library | |
