John Jacob Riley (February 1, 1895 - January 1, 1962) was a U.S. Representative from South Carolina, husband of Corinne Boyd Riley.
Born on a farm near Orangeburg, South Carolina, Riley attended the public schools in Orangeburg County. He was graduated from Wofford College, Spartanburg, South Carolina, in 1915. He taught in the Orangeburg city schools 1915-1917, and at Clemson (South Carolina) Agricultural and Mechanical College in 1917 and 1918. During the First World War served in the United States Navy as a seaman, second class, and as a yeoman, third class, in 1918 and 1919. He engaged in the real estate and insurance business in Sumter, South Carolina from 1919 to 1945. Secretary of a building and loan association 1923-1945. He served as delegate to Democratic State conventions 1928-1944.
Riley was elected as a Democrat to the Seventy-ninth and Eightieth Congresses (January 3, 1945-January 3, 1949). He was an unsuccessful candidate for renomination in 1948.
Riley was elected to the Eighty-second and to the five succeeding Congresses and served from January 3, 1951, until his death at Surfside, near Myrtle Beach, South Carolina, January 1, 1962. He was interred in Sumter Cemetery, Sumter, South Carolina.