Gaz Kuh (Persian: گزكوه) is a village in Titkanlu Rural District of Khabushan District, Faruj County, North Khorasan province, Iran.

At the 2006 National Census, its population was 1,063 in 297 households. The following census in 2011 counted 1,070 people in 316 households. The latest census in 2016 showed a population of 968 people in 286 households. It was the most populous village in its rural district.