David Allen Hahn (born November 3, 1961, Okinawa, Japan) is an American mountaineer, ski patroller and journalist.

Hahn graduated with a Bachelor of Arts degree in history from the State University of New York at Buffalo in 1984.

[5] In 1999, Hahn, who specializes in guiding high, glaciated mountains, led the team that discovered the remains of celebrated English climber George Mallory at 26,760 ft (8,156 m) on Mount Everest's North Face.

Numerous organizations use Hahn as a guide including Rainier Mountaineering (for which he has worked since 1986), and Fathom Expeditions.

He has guided climbers to the summit of Cho Oyu twice, the sixth-highest mountain in the world, bordering Nepal and Tibet.