Diamer or Diamir district) is one of the districts of the Gilgit-Baltistan region of Pakistan. It is the district through which the Karakoram Highway passes. Capital of the district is Chilas.
Diamer District is bounded by Astore District in the east, by the Khyber Pakhtunkhwa in the southwest (separated by the Babusar Pass or Babusar Top), Neelum District in the south, the Ghizer District in the north and northwest, and the Gilgit District in the north and northeast.
Before the Karakoram Highway was opened in 1978, the only road reaching Gilgit town from the south was a rough track north from Balakot to Babusar Pass (via Kaghan, Naran, Besal, and Gittidas) and further north through Babusar Gah to Chilas. The road up to Besal is now in better condition, but from Besal to Babusar Pass, the road is good with new carpetted road.