| Mount Duff | |
| Other Name: | Boundary Peak 174 |
| Elevation Ft: | 7211 |
| Prominence Ft: | 945 |
| Location: | Stikine Region, British Columbia Glacier Bay National Park and Preserve, Alaska |
| Map: | Alaska |
| Map Size: | 208 |
| Coordinates: | 59.8447°N -138.6794°W |
| Topo Maker: | NTS |
Mount Duff, also named Boundary Peak 174, is a mountain in Alaska and British Columbia, located on the Canada–United States border, and part of the Southern Icefield Ranges of the Saint Elias Mountains.[1] It was named in 1923 for Sir Lyman Poore Duff, (1865-1955), a junior counsel before the International Boundary Commission in 1903, and Judge of the Supreme Court of Canada.[2]