| Thomas McKissock | |
| State: | New York |
| Term Start: | March 4, 1849 |
| Term End: | March 3, 1851 |
| Predecessor: | Daniel B. St. John |
| Successor: | William Murray |
| Birth Date: | 17 April 1790 |
| Birth Place: | Montgomery, New York, U.S. |
| Death Place: | Saint Andrew, New York, U.S. |
| Resting Place: | Old Town Cemetery, Newburgh, New York, U.S. |
| Party: | Whig |
| Profession: | Politician, lawyer |
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.