An Australian Army soldier has died and five others have been injured during a training exercise at Mount Bundey, about 100km south-east of Darwin.

A statement from the Department of Defence confirmed the incident occurred yesterday but provided no further details.

"Next of kin has been notified," the statement said.

"We request that the privacy of Defence members and families is respected at this time."

The Mount Bundey training area is used by the Australian Army and its allies for live-fire training.

The Defence Department spokesperson said five other soldiers were injured in the incident and NT Chief Minister Lia Finocchiaro said they were each airlifted to Royal Darwin Hospital.

"The Northern Territory supported two injured evacuations by helicopter to Royal Darwin Hospital at about 7:30 last night and another three by plane at about 9:30 last night," she said.

"I want to offer our sincere condolences to the family of the young service personnel who lost their life yesterday.

"Our thoughts and prayers are with the family who are obviously devastated by this loss and of course, the support of our entire community is there for all of our service personnel who will be feeling this loss immensely."

NT Police Commissioner Martin Dole said he had sent resources to the training facility to assist the Defence Department's investigation.

"We can't comment on the cause of the injury to the defence personnel but we are assisting and we're helping to investigate on behalf of the coroner," he said.

Federal Opposition Leader and Shadow Minister for Defence Angus Taylor offered condolences to the soldier's family, loved ones, and unit mates.

"It's another tragic reminder that our men and women war-fighters put their lives on the line even when they are not on mission," he said.

"We are also thinking of the five soldiers injured in this incident.

"We wish them a full and swift recovery, and our thoughts are with their families who will be supporting them through this very challenging time."

Second Australian soldier death this year

The latest incident is the second death of an Australian soldier this year, after Warrant Officer Class Two Lachlan Muddle from the Special Air Service Regiment died during a training exercise in Jervis Bay in May.

Warrant Officer Muddle fell to the ground after a midair collision with another paratrooper.

The other paratrooper, a sergeant from the Australian Defence Force (ADF) Parachute School, survived the fall with minor injuries.

The Mount Bundey incident is not the first death at the Northern Territory training ground.

In 2017, Australian Army Private Jason Challis was killed there during a live-fire training exercise.

An inquest into his death in 2019 heard Private Challis was shot while standing behind a plywood wall in an urban attack exercise in a setting meant to resemble a village.

The NT coroner described the Victorian soldier's death as being part of a "shambolic" live-fire exercise and partly the result of a "long-held mindset" against rehearsals for combat-like operations.

The Department of Defence later pleaded guilty in the Darwin Local Court to one charge of failing to comply with a health and safety duty.