| Lost Pass | |
| Elevation Ft: | 5571 |
| Location: | Jefferson County, Washington, United States |
| Range: | Olympic Mountains |
| Coords: | 47.8068°N -123.3416°W |
| Topo: | USGS Wellesley Peak |
Lost Pass is a mountain pass crossed by hiking trail in the Olympic Mountains of the state of Washington. It is located on a high ridgeline that separates headwaters of the Dosewallips River from those of the Lost River, just to the west of Lost Peak in the Olympic National Park.