The protected bird is in the care of Project Kereru in Dunedin, where it was referred after treatment at the Dunedin Wildlife Hospital.
It was found in the Herbert forest, Waianakarua, near the camping ground, unable to fly. It was taken to the wildlife hospital and an x-ray showed a bullet lodged in its shoulder.
"Unfortunately they are unsure at this stage as to whether the bird will be able to fly again.
"It is always distressing to see any of our native wildlife admitted to the hospital as a result of the reckless actions of a small minority of people - I'm sure the wider public will share our immense disappointment that this incident has occurred."
On its Facebook page last night the Wildlife Hospital posted that the case was "infuriating and disappointing".
"This beautiful, innocent Kereru was shot by some heartless person and left to suffer and die slowly. We cannot understand who or why someone would want to injure our gorgeous wildlife."
Nik Hurring, from Project Kereru, said on her Facebook page it was still unsure if the injured bird would fly again.
Both the Wildlife Hospital and Project Kereru urged anyone with information to call Doc's 24 hours hotline 0800 DOC HOT.
Kereru were recently named the Bird of the Year. They are protected under the Wildlife Act. It is an offence to hunt or kill them. Offenders could face up to 2 years' jail, fines up to $100,000 or both.