| A. S. Ruth | |
| Office: | President pro tempore of the Washington Senate |
| Term Start: | January 11, 1909 |
| Term End: | January 9, 1911 |
| Predecessor: | Jesse S. Jones |
| Successor: | W. H. Paulhamus |
| Office1: | Member of the Washington State Senate |
| Term1: | 1901 - 1903 (18th district) 1903 - 1913 (22nd district) |
| Birth Date: | 18 December 1865 |
| Birth Place: | Linneus, Maine, United States |
| Death Place: | California, United States |
| Party: | Republican |
Alfred S. Ruth (December 18, 1865 - June 30, 1915) was an American politician in the state of Washington. He served in the Washington State Senate.[1] From 1909 to 1911, he was president pro tempore of the senate.[2]