Mahmood made his international debut at under–21 level, where he was a member of the national team at the 2014 Sultan of Johor Cup in Johor Bahru.[5]
In 2015, he appeared at the 2015 edition of the Sultan of Johor Cup. He followed this up with his first medal with the junior national team, taking home silver at the Junior Asian Cup in Kuantan.[6]
Mahmood made his final appearances for the national under–21 side in 2016. He appeared at a Three–Nations Tournament in Hanover, followed by his third and final Sultan of Johor Cup, where he won a silver medal.[7][8]
Following a successful junior career, Mahmood made his senior international debut in 2017. He made his first appearances during a test series against New Zealand in Wellington.[9] He continued representing the national team in test matches throughout the year, culminating with a bronze medal at the Asian Cup in Dhaka.[6]
Throughout his career, Mahmood has represented Pakistan at numerous major tournaments:[6]
Following a two-year break from international competition, Mahmood returned to the national team in 2024. He was a member of the squad at the 2024 FIH Olympic Qualifiers in Muscat, where Pakistan narrowly missed Olympic qualification.[10][11][2] He won a silver medal at the Sultan Azlan Shah in Ipoh, and represented the national team at the FIH Nations Cup in Gniezno.[12][13] He also competed at the Asian Champions Trophy in Hulunbuir.[6] He has been selected for the 2025–26 Men's FIH Pro League, the team's first season of the league.[14]
