More than 2,000 pages of documents, revealing UFO sightings going back to the 1950s, are included in the files, the New Zealand Dominion Post reports.
The documents detail close encounters by the public, military personnel and commercial pilots.
One of the documents recounts that country's most famous UFO incident, from 1978 over the town of Kaikoura. The crew of a cargo plane reported they were followed by mysterious lights, and air traffic controllers confirmed unexplained radar readings.
The newly released Unidentified Aerial Sightings (UAS) files are being made public by New Zealand's Defence Force, which comprises the country's army, navy and air force services.
The reports were originally kept by Archives New Zealand until the Defence Force removed names and other personal identification information before releasing the material upon public requests.
Air Force Squadron Leader Kavae Tamariki said that the Defence Force didn't have the resources to look into UFOs and that it wouldn't comment on the contents of the reports.
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"We've just been a collection point for the information. We don't investigate or make reports, we haven't substantiated anything in them," Tamariki said.Back in August, the British National Archive released hundreds of reports of UFOs -- part of a collection of 11,000 UFO files gathered by the Defense Ministry since World War II.
A few days after the British story hit the news, the government of Brazil ordered its air force to begin recording any UFO sightings, decreeing that all military and civilian pilots should report their encounters to the national aerospace defence command.
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