David Adams Hollingsworth (November 21, 1844 – December 3, 1929) was a U.S. Representative from Ohio. Born in Belmont, Ohio, Hollingsworth moved with his parents to Flushing, Ohio. He attended the public schools. He served in the Union Army in Company B, Twenty-fifth Regiment, Ohio Volunteer Infantry from 1861 to 1863. He studied law at Mount Union College, Alliance, Ohio. He was admitted to the bar in St. Clairsville, Ohio, on September 17, 1867, and commenced practice in Flushing. He served as mayor of Flushing in 1867. He moved to Cadiz, Ohio, in 1869 and continued the practice of law. Hollingsworth was elected prosecuting attorney of Harrison County in 1873 and reelected in 1875. He served as member of the State senate in 1879 and reelected in 1881. He was admitted to practice before the United States Supreme Court in 1880. He served as chairman of the Republican State convention in 1882. On April 21, 1883, he resigned as Senator to accept appointment as Ohio Attorney General. He did not run for re-election and served until January 14, 1884. He resumed the practice of law in Cadiz. He was one of the organizers of the Ohio State Bar Association, serving as chairman in 1908. Hollingsworth was elected as a Republican to the Sixty-first Congress (March 4, 1909 – March 3, 1911). He was an unsuccessful candidate for reelection in 1910 to the Sixty-second Congress. He resumed the practice of law in Cadiz. Hollingsworth was elected to the Sixty-fourth and Sixty-fifth Congresses (March 4, 1915 – March 3, 1919). He declined to be a candidate for renomination in 1918. He resumed the practice of law until his death in Cadiz, Ohio, December 3, 1929. He was interred in Cadiz Cemetery. He was married April 8, 1875 to Linda McBean of Cadiz. She had two sons, Henry, and Donald, who died in early childhood. Hollingsworth was a Mason, Elk, Knight of Pythias, Methodist, and member of the Grand Army of the Republic.