OUSA is the Otago Uni Students' Association. As a student at the university, you're automatically a member of the OUSA and have access to its facilities and services.
OUSA provides members with representation, welfare, advocacy, recreation, fun events and media. The OUSA is completely independent from the University and can represent you if you need help with a dispute with the University.
They also provide advice and support on a wide range of student issues such as accommodation, queer support, hardship funds and food, amongst many other services.