Stefan Brennsteiner (born 3 October 1991) is an Austrian World Cup alpine ski racer, and specializes in giant slalom.

Brennsteiner made his World Cup debut at age 21 in October 2012 at Sölden, Austria, and reached his first podium in February 2021 at Bansko, Bulgaria.

[1] He represented Austria in the giant slalom at the 2018 Winter Olympics, however, failed to finish his second run.

[2] Brennsteiner achieved his first World Cup podium in February 2021 in Bansko; after finishing his first run in fifth position, he moved ahead of Alexis Pinturault and Henrik Kristoffersen after his second run, finishing in third position.

He competed in the Mixed Team event, in which Austria won the Gold medal, Brennsteiner beating Julian Rauchfuss in his Final heat.