| William L. Mounts | |
| Birth Name: | William Leon Mounts |
| Birth Date: | 31 August 1862 |
| Birth Place: | Carlinville, Illinois, US |
| Death Place: | Carlinville, Illinois, US |
| Occupation: | Lawyer |
| Education: | Blackburn College |
| Party: | Democratic |
| Office1: | Member of the Illinois Senate |
| Term Start1: | 1897 |
| Term End1: | 1901 |
| Office2: | Member of the Illinois House of Representatives |
| Term Start2: | 1893 |
| Term End2: | 1897 |
William Leon Mounts (August 31, 1862 - February 5, 1929) was an American lawyer and politician.
Mounts was born in Carlinville, Illinois. He graduated from Blackburn College in 1881 and was admitted to the Illinois bar in 1885. He practiced law in Carlinville and was involved with the banking business. He served as mayor of Carlinville. Mounts also served as city treasurer and city attorney for Carlinville. Mounts was involved with the Democratic Party. He served in the Illinois House of Representatives from 1893 to 1897 and in the Illinois Senate from 1897 to 1901. Mounts died at his home, in Carlinville, Illinois, from a long illness.[1] [2]