Thomas McKissock (April 17, 1790 – June 26, 1866) was a U.S. Representative from New York.

Born in Montgomery, New York, McKissock studied medicine and law. He was admitted to the bar and commenced practice in Newburgh, New York. He was appointed a puisne justice of the State supreme court in 1847.

McKissock was elected as a Whig to the Thirty-first Congress (March 4, 1849 – March 3, 1851). He was an unsuccessful candidate for reelection in 1850 to the Thirty-second Congress. He died in St. Andrews, Orange County, New York, June 26, 1866. He was interred in Old Town Cemetery, Newburgh, New York.

• United States Congress. "Thomas McKissock (id: M000529)". Biographical Directory of the United States Congress.

 This article incorporates public domain material from the Biographical Directory of the United States Congress