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.