| Gilchrist Porter | |
| State: | Missouri |
| Term Start: | March 4, 1855 |
| Term End: | March 3, 1857 |
| Predecessor: | Alfred W. Lamb |
| Successor: | Thomas L. Anderson |
| State2: | Missouri |
| Term Start2: | March 4, 1851 |
| Term End2: | March 3, 1853 |
| Predecessor2: | William Van Ness Bay |
| Successor2: | Alfred W. Lamb |
| Birth Date: | 1 November 1817 |
| Birth Place: | Windsor, Virginia, U.S. |
| Death Place: | Hannibal, Missouri, U.S. |
| Resting Place: | Riverside Cemetery |
| Party: | Opposition |
| Otherparty: | Whig |
| Profession: | Politician, lawyer, jurist |
Gilchrist Porter (November 1, 1817 – November 1, 1894) was an American lawyer, jurist, and politician who served two non-consecutive terms as a U.S. Representative from Missouri from 1851 to 1853, then again from 1855 to 1857.
Born in Windsor, near Fredericksburg, Virginia, Porter received a limited schooling. He studied law, was admitted to the bar and commenced practice in Bowling Green, Missouri. He owned slaves.
Porter was elected as a Whig to the Thirty-second Congress (March 4, 1851 – March 3, 1853). He was an unsuccessful candidate for reelection in 1852 to the Thirty-third Congress.
Porter was elected as an Opposition Party candidate to the Thirty-fourth Congress (March 4, 1855 – March 3, 1857). He served as chairman of the Committee on Private Land Claims (Thirty-fourth Congress). From 1866 to 1880 he was a Missouri circuit judge.
He resumed the practice of law until his death, which occurred in Hannibal, Missouri on November 1, 1894. He was interred in Riverside Cemetery.