Steptoe Butte  in the northwest United States, is a quartzite island jutting out of the silty loess of the Palouse hills in Whitman County, Washington. It is contained by Steptoe Butte State Park.
The rock that forms the butte is over 400 million years old, in contrast with the 15–7 million year old Columbia River Basalts that underlie the rest of the Palouse. Steptoe Butte has become an archetype, as isolated protrusions of bedrock, such as summits of hills or mountains, in lava flows have come to be called steptoes. Steptoe Butte and Kamiak Butte comprise Steptoe and Kamiak Buttes National Natural Landmark.
A hotel built by Cashup Davis  stood atop the butte from 1888 to 1908, burning down several years after it closed. In 1946, Virgil McCroskey donated 120 acres (0.49 km2) of land to form Steptoe Butte State Park, which was later increased to over 150 acres (0.61 km2). Steptoe Butte is currently recognized as a National Natural Landmark because of its unique geological value. It is named in honor of Colonel Edward Steptoe.
A narrow paved road winds around the butte, leading to a parking area at the summit. Popular activities include:
Visibility: Up to 70–100 miles (110–160 km). Mount Spokane is easily visible, 70 miles (110 km) to the north.
Steptoe Butte from McCroskey State Park
- Steptoe Butte State Park
- Steptoe Butte at GoSleepGo.com
- "National Registry of Natural Landmarks" (PDF). National Natural Landmarks Program. June 2009. p. 103. Retrieved 2014-08-13.
- Cashup Davis and his hotel
- Popular photographs of the area on Flickr
- "Creek". The Spokesman-Review. September 7, 2007. pp. A10. Retrieved 29 April 2015.