| Landaff Andrews | |
| State1: | Kentucky |
| District1: | 11th |
| Term Start1: | March 4, 1839 |
| Term End1: | March 3, 1843 |
| Predecessor1: | Richard Menefee |
| Successor1: | District abolished |
| Office2: | Member of the Kentucky Senate |
| Term2: | 1857 |
| Office3: | Member of the Kentucky House of Representatives |
| Term3: | 1834–1838 1861–1862 |
| Birth Date: | 12 February 1803 |
| Birth Place: | Fleming County, Kentucky, US |
| Death Place: | Flemingsburg, Kentucky, US |
| Restingplace: | Fleming County Cemetery |
| Party: | Whig |
| Alma Mater: | Transylvania University |
| Profession: | Lawyer |
Landaff Watson Andrews (February 12, 1803 – December 23, 1888) was a United States Representative from Kentucky.
Born in Flemingsburg, Kentucky, Andrews graduated from the law department of Transylvania University, Lexington, Kentucky, in 1826 and was admitted to the bar the same year. Andrews commenced practice in Flemingsburg, Kentucky. He was also a slave owner.
Andrews was the prosecuting attorney of Fleming County, Kentucky, 1829–1839, and a member of the Kentucky House of Representatives, 1834–1838. He was elected as a Whig to the Twenty-sixth and Twenty-seventh Congresses (March 4, 1839 – March 3, 1843) but was an unsuccessful candidate for reelection in 1842 to the Twenty-eighth Congress. After leaving Congress, he served in the Kentucky Senate as an independent candidate in 1857 and was again elected a member of the Kentucky House of Representatives, in 1861, and served until 1862, when he resigned.
After leaving the state legislature, Andrews was the judge of the circuit court, 1862–1868. He resumed the practice of law in Flemingsburg, Kentucky where he died in 1888. His year of death is often given erroneously as 1887.[1] He was buried in Fleming County Cemetery.