John C. Ten Eyck (March 12, 1814 - August 24, 1879) was a United States Senator from New Jersey. Born in Freehold, New Jersey, he completed preparatory studies under private tutors, studied law, was admitted to the bar in 1835, and commenced practice in Burlington, New Jersey. He was prosecuting attorney for Burlington County in 1839 and 1840, and was a delegate to the New Jersey constitutional convention of 1844.
Ten Eyck was elected to the U.S. Senate as a Republican and served from March 4, 1859, to March 3, 1865; he was an unsuccessful candidate for reelection, and was appointed a member of a commission to revise the New Jersey constitution in 1875, and for a time was president of the commission. He died in Mount Holly, New Jersey in 1879 and was interred in St. Andrew's Cemetery.