Douglas Applegate (born March 27, 1928) is a former Representative from Ohio.
Born in Steubenville, Ohio, he attended the public schools, and graduated from Steubenville High School in 1947, after which he engaged in the real estate business. In 1976 he was elected to the United States House of Representatives as a Democrat and was reelected 8 more times until his retirement in 1994. In 1964 he was a delegate to the Democratic National Convention. He served in the Ohio state Senate from 1969 until 1976.