A Nato soldier died following an improvised explosive device (IED) attack in southern Afghanistan on Friday, Isaf said in a statement.
Isaf did not disclose further information about the exact location and nationality of the soldier, but mostly US and British soldiers are based in southern Afghanistan.
The death brings the number of foreign troop deaths in the Afghan war to nine this year.
More than three US troops, two British and four other Nato-led troops have been killed this year out of around 66,000 US troops and 37,000 troops of other nations in Afghanistan.