The Alpine Academy driver set a 1m47.055s two minutes from the end of the session and despite an early last attempt, no other drivers were able to better his time.
Mini, who finished second in Formula Regional European Championship last season, moved to the top of the times early during the 30-minute qualifying session ahead of series returnee Pepe Marti (Campos Racing).
At the halfway mark, the Frenchman was the only driver to set a sub 1m48s time, and improved on his second attempt to recapture provisional pole before again bettering his time to take the top spot.
Despite a risky early final run while others behind him improved on their times, Mini had done enough to secure pole on his debut.
He led the session ahead of Trident’s Gabriel Bortoleto, who topped practice earlier in the day, and Gregoire Saucy, who continues for his second season with ART Grand Prix.
Mini was one of 19 rookies driving in the session, and led from early on in the session at Sakhir.
He was briefly toppled by Bortoleto, before his first time was deleted, and despite a difficult second run managed to retain the top spot.
Fellow Hitech driver Sebastian Montoya slotted into second, with Taylor Barnard in third for Jenzer Motorsport.
Zak O’Sullivan was next to take the lead for Prema Racing, having joined the Italian outfit from Carlin this year, before Caio Collet (Van Amersfoort Racing) took the top spot.
Third-year driver Collet was quickly demoted once again by Mini, who set a 1m47.118s benchmark while Montoya returned to second.
Mini then improved again to a 1m47.055s before returning to the pits while the rest of the field set their final laps.
Saucy came very close to his best time with two minutes remaining, as did Bortoleto with a 1m47.112s, but Mini retained the top spot for his debut pole.
Reigning Euroformula Open champion Oliver Goethe will line up fourth for Campos Racing, with team-mate and fellow rookie Hugh Barter in fifth.
Kaylen Frederick, who joins ART from Carlin for his second F3 season, will start Sunday’s race from sixth, with Trident’s Leonardo Fornaroli in seventh place, with the Prema trio of Dino Beganovic, Paul Aron and O’Sullivan rounding off the top 10.
Marti will start on reverse-grid pole for Saturday’s sprint race ahead of Collet.
Results to follow
