Brazilian-born Emirati midfielder Yuri Cesar gave Shabab Al Ahli the lead right before the half-hour mark at the Ahmad bin Ali Stadium, before a Renan’s own goal drew the home side level in the 42nd minute.
Azmoun restored the lead for the Emirati outfit seven minutes after the break, finishing off a diagonal cross from Guilherme Bala in the 18-yard box with a simple tap-in.
This was a 17th goal in 19 games across all competitions for the Iranian international, who has contributed with four assists in his debut season in the Asian club football.
Bala found the net himself in the seventh minute of added time as Shabab Al Ahli won a second title in as many years in the Qatar-UAE Super Cup, having beaten Al Duhail 2-1 to win the Super Shield in Dubai in the inaugural bilateral tournament last year.