| Term Start: | 1910 |
| Term End: | 1912 |
| Term Start2: | 1901 |
| Term End2: | 1902 |
| Birth Name: | Loyal Johnston Martin |
| Death Place: | Tulsa, Oklahoma |
| Party: | Populist Party |
Loyal Johnston Martin (February 16, 1863 – April 22, 1950) was an American lawyer and politician who served as the 11th Mayor of Tulsa from 1910–12 and in the South Dakota Senate from 1901–2.[1]
Martin was born in 1863 in Oceola, Ohio, the son of physician David Dunn Martin. The family moved to Oneida, Illinois when he was aged 3. He attended Knox College in Illinois and University of Michigan Law School. He began his law career in 1889 in Miner County, South Dakota.[1]
He served in the South Dakota Senate between 1901 and 1902 representing Miner County as a member of the Populist Party.[2] He later moved to Tulsa where he was the chamber of commerce president in 1903 and helped fundraise for Tulsa's first opera house. He served as the 11th Mayor of Tulsa from 1910–2 and later as a judge of the Superior Court of Tulsa County from 1920–23.[3]