The prestigious fellowship rewards a teacher for their contribution to the school and provides them with an opportunity of extended professional development up to the value of $20,000.
Candidates were nominated across a range of departments and co-curricular activities.
The fellowship was announced by Otago Girls' High School board of trustees chairwoman Victoria Deaker during a lunch at the school yesterday.
The announcement came as a surprise to Ms Geddes.
Ms Deaker described her as a hardworking, dedicated staff member, a committed teacher with high levels of enthusiasm and a person very supportive of the school community.
She has taught science and mathematics, and has been a specialist geography and social studies teacher at Otago Girls' High School for the past eight years.
She has also been the year 9 dean, taught tourism and dance, been teacher in charge of Gateway and the school council, she maintains a link to Careers Pathways, has been a member of the PB4L initiative, has led or assisted numerous camps, marae trips and school tours within New Zealand and overseas, and has been teacher in charge of hockey, tennis, and multisport while also coaching hockey.
Ms Geddes will now decide how she will use the fellowship.