| Abbreviation | Definition |
|---|---|
| CPW | Charles, Prince of Wales |
| CPW | Cheng P. Wen, Inventor of the Co-Planar Waveguide |
| CR | Christopher Ryan |
| CRB | Charles R. Bronfman |
| CS | Carl Sagan |
| CS | Casey Stengel |
| CS | Charles Springer |
| CS | Charlie Springer |
| CS | Clive Staples |
| CSM | Charles S. Morris |
| CT | Charles Tyrwhitt |
| CTC | Charles Thomas Cayce |
| CW | Chilly Willy |
| C-WEBB | Chris Webber, Basketball Player |
| CWN | Fleet Admiral Chester W. Nimitz |
| DA | Don Albert |
| DAd | Domenico Adamo |
| DAG | David Alan Grier |
| DAN | Dr. Anand Nadkarni |
| DB | David Bowie |