Ao Tawhiti or Ao Tawhiti Unlimited Discovery (abbreviated "ATUD") is a state area school in Christchurch, New Zealand. It was established by the merging of two separate Christchurch inner city schools; the primary school Discovery 1 (unofficially Discovery or D1) and the secondary school Unlimited Paenga Tawhiti (better known as Unlimited or UPT for short). The school is one of eleven schools running under the "Designated Special Character" criteria of the Education Act 1989.