| Category | Description | Application |
|---|---|---|
| A | Always address by surname, and with particular deference. | members of the Regent House, fellows and staff (academic and non-academic) of the University and the Colleges, persons possessing a doctoral or professorial title, current and former supervisors |
| B | Always address by surname. | graduate students |
| C | Address by surname, unless explicitly invited to do otherwise. | |
| D | Address by surname, unless implicitly invited to do otherwise. | undergraduate students |