Otago Girls' High School (OGHS) is a secondary school in Dunedin, Otago, New Zealand. It was opened 6 February 1871, after a long campaign by Learmonth Whyte Dalrymple. It is reputedly the oldest girls state-run secondary school in the Southern Hemisphere and the sixth oldest of its type in the world. The school has its own radio show on Otago Access Radio.