Edgar Dean Crumpacker (May 27, 1851 – May 19, 1920) was a U.S. Representative from Indiana, father of Maurice Edgar Crumpacker and cousin of Shepard J. Crumpacker, Jr..
Born in Westville, Indiana, Crumpacker attended the common schools and Valparaiso Academy, Valparaiso, Indiana. He studied law in the law department of Indiana University at Bloomington. He was admitted to the bar in 1876 and commenced practice in Valparaiso, Indiana. He served as prosecuting attorney for the thirty-first judicial district of Indiana 1884–1888. He served as appellate judge, by appointment of Governor Hovey, from March 1891 to January 1, 1893.
Crumpacker was elected as a Republican to the Fifty-fifth and to the seven succeeding Congresses (March 4, 1897-March 3, 1913). He served as chairman of the Committee on the Census (Fifty-eighth through Sixty-first Congresses). He was an unsuccessful candidate for reelection in 1912 to the Sixty-third Congress. He resumed the practice of law in Valparaiso, Indiana, where he died May 19, 1920. He was interred in Graceland Cemetery.