Byron is an unincorporated community in Yakima County, Washington, United States, located approximately three miles west of Prosser.
The community was founded in 1908 by the Byron Improvement Company. According to local settlers, the community was named after surveyors found a post marked 'Byron', which was sent in 1890 by the Northern Pacific Railway Company.
The railroad's records contain notes stating that Earl Byron, a sheep herder, had a railroad siding for loading sheep onto railroad cars, at the town location in 1881. Byron's post office was open from August 4, 1909 until January 31, 1955.