For the city of Cambridge, Massachusetts, USA:
* Camb. is commonly used.
For the city of Cambridge, England, UK:
* Cambs. is the standard abbreviation.
For the University of Cambridge:
* Univ. of Camb. or simply Cambridge is used.
It's important to note that abbreviations can vary depending on the specific source or context. If you are unsure, it's best to spell out the full name.