Thomas Sinnickson (December 13, 1786 – February 17, 1873) was an American jurist and statesman from Salem, New Jersey. He represented New Jersey in the United States House of Representatives in 1828–1829. He was a judge of the court of errors and appeals of New Jersey, and a judge of the court of common pleas for twenty years.^[1]

He was the nephew of Congressman Thomas Sinnickson (1744–1817)

He was interred at St. John's Episcopal Cemetery in Salem, New Jersey.