| John Williamson | |
| Birth Date: | 23 May 1901 |
| Birth Place: | Kinross, Scotland |
| Death Place: | Baltimore, Maryland, US |
| Field: | Mathematics |
| Alma Mater: | University of Edinburgh, University of Chicago |
| Known For: | Williamson construction of Hadamard matrices |
John Williamson (23 May 1901 – 1949) was a Scottish mathematician who worked in the fields of algebra, invariant theory, and linear algebra. Among other contributions, he is known for the Williamson construction of Hadamard matrices.[1] Williamson graduated from the University of Edinburgh with first-class honours in 1922. Awarded a Commonwealth Fellowship in 1925, he studied at the University of Chicago under the direction of L. E. Dickson and E. H. Moore, receiving the Ph.D. in 1927. He held a Lectureship in Mathematics at the University of St Andrews and an Associate Professorship in Mathematics at Johns Hopkins University.