Bethany is an unincorporated community and census-designated place in Washington County, Oregon, United States. It is situated north of U.S. Route 26 near Beaverton, approximately four miles northwest of Cedar Mill, and is within the Portland metropolitan area.

The name Bethany was first applied to a crossroads trading center about two miles northeast of the current location, where a Presbyterian church stands today. The area was first settled by Ulrich Gerber, who came from Switzerland in the mid-1870s. Gerber helped establish the first post office in the area in 1878, about a mile east of the current Bethany School, and suggested the name Bethany. The post office was discontinued in 1904.