Diocesan School for Girls (Dio) is a private girls' school in Epsom, Auckland, New Zealand. It is consistently a top-achieving school nationally. The school is Anglican-based and was established in 1903. It caters to international students and has accommodation for 50 boarders at Innes House. The school elected to offer students the option of International Baccalaureate diplomas, as an alternative to the national NCEA qualification, from 2008.
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History
Bishop Moore Richard Neligan first proposed the Diocesan School for Girls in October 1903. A subcommittee of the synod purchased land in November 1903, and the first class began on 27 May 1904 with twenty-five students and Mary Etheldred Pulling as headmistress. Neligan formally dedicated the school on 14 June 1904, and the school celebrates its birthday on this date. The founders were Auckland businessperson Stephen Cochrane, Dr Ernest Roberton, Lord Ranfurly, Edwin Mitchelson, Bishop Williams of Waiapu and Bishop Neligan
The former Goodall Construction company constructed many of the buildings.
Enrolment
As a private school, Diocesan School charges tuition fees to cover costs. For the 2025 school year, tuition fees for New Zealand residents are $25,880 per year for students in years 1 to 6 and $29,870 per year for students in years 7 and above. Boarding fees are an additional $21,210 per year.
At the school's May 2021 Education Review Office (ERO) review, Diocesan School had 1,659 students, including 35 international students. Around 59 percent of students at the school identified as New Zealand European (Pākehā), 31 percent as Asian, 0.5 percent as Māori, and 0.2 percent as Pacific Islanders.
As of July 2026, Diocesan School has roll of 1,725 students, of which 98 (5.7%) identify as Māori. As a private school, the school is not assigned an Equity Index.
Technology
The school opened a $4 million science block in 1999. During that year a pilot system to supply all students with notebooks was run with two year-8 classes. By November 1999 the school had three IT staff, supporting 469 PCs (150 of which were notebooks), 110 printers, and 6 file servers. The school introduced electronic whiteboards in 2005 that allow students to download class notes directly to their notebooks. In 2006, it ranked as the 96th largest IT organisation in New Zealand, with a staff of eight supporting 300 PCs and 1,170 notebooks. in 2012 the school officially opened a new water-based sports turf and underground car park. The sports turf is identical in likeness to the one in London built for the 2012 London olympics.
Headmistresses and principals
Since the school was established, there have been 11 headmistresses or principals.
Notable alumnae
Stephanie Bond – netball player
Margaret Brimble – chemist
Alice Bush – doctor and paediatrician
Niki Caro – writer and director of Whale Rider and Mulan
Kimberley Crossman – Shortland Street and Power Rangers Samurai television actor
Tessa Duder – children's author and swimming champion
Sian Elias – New Zealand's first female Chief Justice
Holly Rose Emery – model
Georgia Fowler – supermodel
Charlotte Glennie – television journalist
Katie Glynn – field hockey player, member of Black Sticks Women (2009–)
Christobelle Grierson-Ryrie – winner of the first cycle of New Zealand's Next Top Model, attended in 2009
Ella Gunson – field hockey player, member of Black Sticks Women (2009–)
Samantha Harrison – field hockey player, member of Black Sticks Women (2009–) (also attended Whangarei Girls' High School)
Anna Lawrence – Olympic field hockey midfielder
Jamie McDell – New Zealand singer, before moving on to King's College
Meredith Orr – Olympic field hockey midfielder