Sinnickson may refer to:
People: Clement Hall Sinnickson (1834–1919), American Republican Party politician Thomas Sinnickson (jurist) (1786–1873), American jurist and statesman from Salem, New Jersey Thomas Sinnickson (merchant) (1744–1817), American merchant and statesman from Salem, New Jersey
Geography: Sinnickson, Virginia, unincorporated community in Accomack County, Virginia