Figures from university proctor Dave Scott showed 25 external notices were also issued between 2017 and 2019.
"We are also called, on occasion, to serve a trespass notice on behalf of another, a non-University of Otago business or a student.
"An example might be where police refer a student for a breach of the student code of conduct, where, for example, a licensed premises is involved and the licensed premises seeks as part of the outcome that the student is trespassed from their establishment.
"Another example is where a student requests an ex-partner be trespassed from their flat."
Trespass notices issued so far this year numbered 15.
Students could be trespassed as part of a code of conduct matter - for example if a second-year student returned to their old residential college and caused issues, part of the outcome would be to trespass them from that address for the remainder of the year.
Code of conduct matters range from physical or sexual assault to incidents such as couch burning, verbal abuse and throwing bottles.
"We also deal with non-students who come on to campus and, over time, disrupt or cause risk, leading to them being trespassed - people whose behaviour disrupts study or fails to meet minimum standards of behaviour causing us to intervene," Mr Scott said.
"On these occasions it is often a pattern of behaviour over time, where we note the interaction, move the person on but do not immediately issue a trespass notice."
People were noted and moved on when the interaction was noted and the person was asked to move.