A convicted murderer and a violent sex attacker have escaped from Tongariro Rangipo Prison, near Turangi, in the central North Island.
Police said Stuart Martin Harrison and Sumit Carrik Narayan were both considered dangerous and should not be approached.
Harrison was last seen in the prison's Hautu unit about 7.50am today, police said. While police were investigating his disappearance they realised Narayan had also escaped.
Harrison is described as Maori, 175cm tall and with black, collar-length hair. Police said he was last seen wearing blue jeans a black cap or beanie, a dark jersey and a blue and white checked jacket.
Narayan is a 30-year-old Fijian Indian, 184cm tall, with a shaved head. It is not known what he was wearing when he escaped.