Qazi (Persian: قاضي) is a city in, and the capital of, Samalqan District of Samalqan County, North Khorasan province, Iran. It also serves as the administrative center for Qazi Rural District (formerly Samalqan Rural District).

At the 2006 census, its population was 2,370 in 674 households. The following census in 2011 counted 2,956 people in 792 households. The latest census in 2016 showed a population of 2,428 people in 817 households.