Klahanie is a census-designated place (CDP) in King County, Washington, United States. The population was 10,674 at the 2010 census. Klahanie is an upscale planned community between the cities of Sammamish and Issaquah.
In a 2005 vote, residents of Klahanie accepted incorporation into the city of Issaquah but did not accept the debts of Issaquah, and remains unincorporated today.
Klahanie is home to many different neighbourhoods inside its boundaries, such as Heatherwood and The Willows. There are two schools in Klahanie, Beaver Lake Middle School and Challenger Elementary School, both in the Issaquah School District. There are two community pools, many tennis courts, basketball courts, and parks in Klahanie.