NA-21 (Mardan-I) (این اے-21، مردان-۱) is a constituency for the National Assembly of Pakistan. The constituency was formerly known as NA-11 (Mardan-III) from 1977 to 2018. The name changed to NA-20 (Mardan-I) after the delimitation in 2018 and to NA-21 (Mardan-I) after the delimitation in 2022.