Brett Rheeder (born February 16, 1993) is a professional freeride mountain bike rider from Mount Albert, Ontario.

Rheeder is an X-Games athlete and gold medalist winner of the 2013 Munich Slopestyle Mountain Bike event.

In October 2022 he placed first in Red Bull Rampage[9][10][11] With Brandon Semenuk, Rheeder was part of the Trek C3 Project, which came first in the Freeride Mountain Bike Factory Team Rankings in 2014, 2015 and 2017.

[14] In January 2023, Rheeder announced he was retiring from competitions, "focusing time on progressing [his] riding in new ways, creating new media, having fun with social media, and ... helping develop the next generation of slopestyle and freeride as a whole; its courses, its athletes, its training grounds, its products.

In an Instagram post Rheeder cited that regaining his creativity in slopestyle riding and stepping back from the stresses and injuries associated with competition would be the best option to preserve the longevity of his career.