William W. Irwin | |
|---|---|
 Portrait of William W. Irwin, c. 1840–1841 | |
| United States Ambassador to Denmark | |
| In office 1843–1847 | |
| Preceded by | Isaac Rand Jackson |
| Succeeded by | Robert P. Flenniken |
| Member of the U.S. House of Representatives from Pennsylvania's 22nd district | |
| In office March 4, 1841 – March 4, 1843 | |
| Preceded by | Henry Marie Brackenridge |
| Succeeded by | Samuel Hays |
| 10th Mayor of Pittsburgh | |
| In office 1840–1841 | |
| Preceded by | William Little |
| Succeeded by | James Thomson |
| Personal details | |
| Born | 1803 Pittsburgh, Pennsylvania |
| Died | September 15, 1856 (aged 52–53) Pittsburgh, Pennsylvania |
| Political party | Whig |
| Spouse(s) | Frances Everallyn Rose Irwin (?–1836, her death) Sophia Arabella Bache (1839–1856, his death) |
| Children | John Irwin Agnes Irwin Robert Walker Irwin |
| Alma mater | University of Pittsburgh Allegheny College |
William Wallace Irwin (1803 – September 15, 1856) was Mayor of Pittsburgh and a Whig member of the U.S. House of Representatives from Pennsylvania.