Elgin is a city in Union County, Oregon, United States. The population was 1,711 at the 2010 census. The community is named after the Lady Elgin, a ship lost on Lake Michigan.

Union County is one of the 36 counties in the U.S. state of Oregon, and one of the 8 counties of eastern Oregon. As of the 2020 census, the population was 26,196. The county comprises the La Grande micropolitan statistical area and the county seat is La Grande.