Another young Aboriginal man has died in custody in Darwin, the Northern Territory Department of Corrections has confirmed.

The 26-year-old was found unresponsive by Darwin Correctional Centre staff around 7:50am on Saturday.

A spokesperson for the Department said the death had been reported to the NT Coroner and will be subject to "an independent investigation".

"The cause of death is a matter for the Coroner to determine, but the Department is treating it as a suicide," the spokesperson said.

Northern Territory police said a report is being prepared for the coroner.

"Medical assistance was provided but the man was declared deceased at the scene," an NT Police spokesperson said in a statement.

The young man's death comes just days after the death in police custody of a 25-year-old Aboriginal man, also in Darwin. Global human rights watchdog Amnesty International has called a "fully independent" investigation into the circumstances surrounding that death.

More than 600 Aboriginal and Torres Strait Islander people have died in custody since the Royal Commission into Aboriginal Deaths in Custody brought down its findings and issued more than 300 recommendations for reform in 1991, many of which are yet to be implemented.

The latest Closing the Gap data, published by the Productivity Commission earlier this month, reveal worsening rates of both incarceration and self-harm.

The NT showed the steepest increase off the baseline set in 2019 in adult incarceration after the Territory's CLP government introduced a suite of "tough on crime" measures.

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