William W. Irwin
- This article is about the mayor of Pittsburgh, for other people named William Irwin see William Irwin (disambiguation).
Early life 
William Irwin was born in Pittsburgh in 1803, and as a boy earned the lifelong nickname "pony Irwin" because of his habit of riding a pony everywhere he went. He was a graduate of Allegheny College. Coming home to Pittsburgh he ran successfully for Allegheny County District Attorney in 1838.
Marriage and family 
Irwin's first wife was Frances Everallyn Rose Irwin (April 1809–February 24, 1836), the niece of Illinois Supreme Court justice Theophilus W. Smith and aunt of bridge engineer Charles Shaler Smith. They were the parents of United States Navy Rear Admiral John Irwin (1832-1901).
After his first wife's death, Irwin remarried on February 28, 1839 at Philadelphia, Pennsylvania, Sophia Arabella Bache, born November 14, 1815 at Philadelphia, Pennsylvania, and died on March 24, 1904 at Philadelphia, Pennsylvania. She was the daughter of Richard Bache, Jr., who served in the Republic of Texas Navy and was elected as a Representative to the Second Texas Legislature in 1847 and Sophia Burrell Dallas, the daughter of Arabella Maria Smith and Alexander J. Dallas an American statesman who served as the U.S. Treasury Secretary under President James Madison. She was also granddaughter of Sarah Franklin Bache and Richard Bache, and more notably she was the great-granddaughter of Benjamin Franklin as well as a niece of George Mifflin Dallas the 11th Vice President of the United States, serving under James K. Polk. They were the parents of educator Agnes Irwin and American businessman and the Kingdom of Hawaii's Minister to Japan, Robert Walker Irwin.
Pittsburgh politics 
Upon being elected mayor in 1840 Irwin oversaw the expansion of infrastructure and government in the city to catch up with the regions rapid expansion. Under his administration four additional wards were added to the city.
United States House of Representatives 
Later life 
- "Find-A-Grave Memorial: Frances Everallyn Rose Irwin (1809-1836)". Findagrave.com. Retrieved 2012-06-27.
- "Find-A-Grave Memorial: Adm John Irwin (1832-1901)". Findagrave.com. Retrieved 2012-06-27.
- William W. Irwin at the Biographical Directory of the United States Congress
- The Mayors of Pittsburgh
- The Political Graveyard
- William W. Irwin at Find a Grave
|Mayor of Pittsburgh
|United States House of Representatives|
Henry Marie Brackenridge
|Member of the U.S. House of Representatives
from Pennsylvania's 22nd congressional district
Isaac Rand Jackson
|U.S. Ambassador to Denmark
As Chargé d’Affaires
Robert P. Flenniken