Several guns and computers have been stolen in a break-in at an Australian Defence Force barracks on the NSW mid north coast.

The theft was revealed by NSW Police on Wednesday.

A number of .22 calibre rifles - police could not confirm the exact number - and several laptop computers were taken from Macquarie Barracks in Taree.

The information contained on the laptops is not known.

An investigation was launched when the equipment was discovered missing from the Muldoon Street site.