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Emergency services were called to the scene, between Lake McKenzie Hut and Routeburn Falls Hut, about 12.45pm yesterday.
The 70-year-old Australian, who has not yet been named, had been part of a multi-day guided walk with Ultimate Hikes when he fell, about 12.30pm.
The group, accompanied by four guides, was on the second day of a three-day trek that starts at The Divide and ends at the Routeburn Shelter.
The man had been walking up a rise on the track and was about to walk on to a bridge when he slipped and fell, Ultimate Hikes said in a statement today.
A guide and a walker, who is also a trained emergency physician, were behind him and immediately assisted, along with two other guides. However, the man was unable to be revived.
Police, WorkSafe and the Department of Conservation have been notified.
Ultimate Hikes general manager Noel Saxon said conditions were wet and windy, but not considered unsafe to walk.
“Our sincerest condolences go out to the man’s family and friends at this very sad time. We are focused on supporting his family, the other walkers in the group and our staff who may have been affected.
"We will also be working with the appropriate authorities as investigations commence.”