Nine Mile Falls is an unincorporated community in Spokane County, Washington and Stevens County, Washington, United States. The community straddles the Spokane River 9 miles (14 km) away from downtown Spokane, at the location of a former falls that has been the site of Nine Mile Dam since 1908. Following the river, the community is located 16 miles (26 km) downstream from downtown.

Riverside State Park is a Washington state park located 9 miles (14 km) northwest of Spokane in the community of Nine Mile Falls. The park protects 11,162 acres (4,517 ha) of Okanagan dry forest along the Spokane and Little Spokane rivers. It is the second largest state park in Washington after Mount Spokane State Park and is a popular recreation area for locals.