Cortinarius barlowensis is a species of mushroom in the family Cortinariaceae. It is uncommon.
The cap of Cortinarius barlowensis is grayish brown in color. It can be convex or umbonate, and is about 1.9-3 centimeters in diameter. The stipe is about 5-10 centimeters long and 0.3-0.5 centimeters wide, and is slightly wider at the base. It is bluish, purplish, or grayish. The gills are purplish to brown, and are adnexed.
Cortinarius barlowensis is found under conifers in old growth forests. It is often found at low elevations. The type locality is Barlow Pass, Washington State, United States.