Otago Girls' High School is working through formal disciplinary processes after a video of a fight breaking out at school emerged.
The video shows a group of pupils in school uniform fighting in what appears to be a school hall corridor on Wednesday.
Principal Bridget Davidson said the school was taking the incident "very seriously."
"We have extremely high expectations for student behaviour and respect for others."
The school was working through formal disciplinary processes, which included liaising with organisations including the Ministry of Education.