Clement Hall Sinnickson (September 16, 1834 – July 24, 1919), was an American Republican Party politician, who served in the United States House of Representatives, where he represented New Jersey's 1st congressional district from 1875 to 1879. He is the grandnephew of Thomas Sinnickson, who was also a former Representative from New Jersey. Sinnickson died in Salem, New Jersey on July 24, 1919, and was interred at St. John's Episcopal Cemetery.