| Birth Name: | William Augustus Hall |
| Birth Date: | 15 October 1815 |
| Birth Place: | Portland, Maine, U.S. |
| Death Place: | Missouri, U.S. |
| Relatives: | John H. Hall (father) William Preble Hall (son) Uriel Sebree Hall (son) Willard Preble Hall (brother) |
| State: | Missouri |
| Constituency: | 3rd district (1862–1863) 9th district (1863–1865) |
| Term Start: | January 20, 1862 |
| Term End: | March 3, 1865 |
| Preceded: | John Bullock Clark |
| Succeeded: | John F. Benjamin |
| Party: | Democratic |
William Augustus Hall (October 15, 1815 – December 15, 1888) was an American politician who served in the US House of Representatives. He was the son of John H. Hall, industrialist and inventor of the M1819 Hall rifle, the brother of Missouri Governor and Representative Willard Preble Hall and the father of Representative Uriel Sebree Hall and Medal of Honor recipient William Preble Hall.
Born in Portland, Maine, on October 15, 1815, Hall moved with his family to Harpers Ferry, Virginia, at a young age and attended the local schools there. He attended Yale College, relocated to Missouri in 1840, and was admitted to its bar in 1841.
Hall served as a captain in the Mexican-American War. In the 1850 United States census, he was recorded as owning four slaves.[1] He served as judge of the Circuit Court in Missouri from 1847 to 1861 and as delegate to the Missouri Constitutional Convention in 1861. That year, he was elected to the 37th Congress as a replacement for John Bullock Clark, who had been expelled from Congress for taking up arms against the United States. He was elected on his own merit in 1862 and served from January 20, 1862 to March 4, 1865. He did not seek an additional term in 1864.
In 1855, he was the judge who presided over the trial of Celia, a 19-year-old pregnant slave woman who was on trial for the alleged murder in self-defense of her master, who had been sexually abusing her for years. Hall's personal views on slavery are not known, but he is known to have had strong unionist views. Given his position he would have been well aware of the media attention and the implications the outcome of the trial could have for Missouri and the nation.[2] To defend Celia, Hall appointed John Jameson, a recently ordained minister who had served in congress and had been speaker of the Missouri state house. Jameson had a reputation as an excellent trial attorney. Hall also appointed two other attorneys from prominent Callaway County families to assist Jameson.
Hall's approach to the trial gives support to the view that he wished the trial procedures to be perceived as correct and fair insofar as the laws of Missouri allowed.[3] The jury found Celia guilty and sentenced her to death. The conviction, and Hall's rulings, were affirmed by the Missouri Supreme Court.[4] He served as a delegate to the Democratic National Convention in 1864.
After his term in Congress ended, Hall returned to the practice of law. He died near Darksville, Missouri, on December 15, 1888 and was buried in a family plot.