Bothell () is a city in King and Snohomish counties in the U.S. state of Washington. It is part of the Seattle metropolitan area. As of the 2010 census it had a population of 33,505, and in 2019 the estimated population was 47,415.
Prior to European settlement, the Sammamish River valley from Lake Washington to Issaquah Creek south and upstream of Lake Sammamish was inhabited by a population of as many as 200 Native Americans known as the Sammamish people. The Sammamish were relocated after the Puget Sound War in 1856 to reservations and non-reservation lands.
In 1870, Columbus S. Greenleaf and George R. Wilson filed land claims in the area formerly inhabited by the Sammamish near present-day Bothell, and built homes. Eight families followed over the next six years. In 1876, Canadian George Brackett bought land and began commercial logging out of a camp located on the north bank of the Sammamish River in what is now the heart of downtown Bothell. A store, school, and sawmill followed over the next several years.
In 1885, Brackett sold 80 acres (32 ha) to David Bothell, a settler from Pennsylvania. The town's first postmaster, who bought his property from Bothell, named the town in his honor when it was platted in 1888. Later that same year, a local railroad was built through the town to transport coal from Issaquah.