Gas Works Park is a park located in Seattle, Washington, United States. It has a 19.1-acre public park on the site of the former Seattle Gas Light Company gasification plant, located on the north shore of Lake Union at the south end of the Wallingford neighborhood. The park was added to the National Register of Historic Places on January 2, 2013, over a decade after being nominated. Gas Works Park contains remnants of the sole remaining coal gasification plant in the United States.