| Abbreviation | Definition |
|---|---|
| BYR | BackYard Rinks, Ltd. |
| BYR | Bake Young Realty |
| BYR | Baytree Real Estate |
| BYY | Brewer Yacht Yard at Greenport, Greenport, New York |
| BYY | Brewer Yacht Yards |
| BZ | Berliner Zeitung |
| BZ | Big Zimage |
| BZ | Brucks Zeitung |
| BZP | Big Zeke Productions, LLC |
| BZW | Maritainer France, S. A. |
| C | Chrysler |
| C&A | Clemens and August Brenninkmeijer |
| C&EA | Communications External Affairs |
| C&EA | Communications & External Affairs |
| C&P | INSCOM Control and Processing Company |
| C.L.E.A.N. | Closed Loop Environmental Alliance Network Inc. |
| C31 | Channel 31 |
| CA | Company Advisor |
| CA | Computer Associates |
| CA | Continental Accessories |