| Lewis Glacier | |
| Type: | Mountain glacier |
| Location: | Cascade Range, Deschutes County, Oregon, U.S. |
| Map: | USA Oregon |
| Label Position: | right |
| Map Size: | 225 |
| Coordinates: | 44.095°N -121.7667°W |
| Coordinates Ref: | [1] |
| Length: | 3000feet |
| Terminus: | Barren rock |
| Status: | Retreating |
Lewis Glacier is in the U.S. state of Oregon. The glacier is situated in the Cascade Range at an elevation generally above . Lewis Glacier is on the southeast slopes of South Sister, an inactive stratovolcano.[2] Since its last maximum extent during the Little Ice Age (1350–1850 A.D.) where it descended to an elevation of 6447feet, the glacier has been in a general state of retreat and the terminus of the glacier was reported in 2005 to be at approximately 8790feet.[3]