| John A. Davidson | |
| State Senate: | Illinois |
| State: | Illinois |
| District: | 50th |
| Term Start: | 1973 |
| Term End: | 1993 |
| Preceded: | Robert W. McCarthy[1] |
| Succeeded: | Karen Hasara |
| Party: | Republican |
| Birth Place: | West Point, Mississippi |
| Birth Date: | 31 August 1924 |
| Death Place: | Springfield, Illinois |
| Profession: | Chiropractic physician |
| Spouse: | Shirley |
| Residence: | Springfield, Illinois |
| Branch: | United States Navy |
| Serviceyears: | 1943-1946[2] |
| Unit: | Navy Air Corp |
| Battles: | World War II |
John A. Davidson (August 31, 1924 - August 21, 2012) was an American politician.
Born in West Point, Mississippi, Davidson graduated from Petersburg, Illinois High School. Davidson served in the Illinois Senate 1973–1993. He served in the United States Navy Air Corp during World War II and was a chiropractor. He served on the Sangamon County, Illinois Board and was chairman of the board prior to being elected to the Illinois Senate. In 1971, he was a delegate to the White House Conference on Aging.[3]
He died due to congestive heart failure on August 21, 2012, in Springfield, Illinois.[4]