| Francis Armstrong | |
| Order: | 7th |
| Office: | Mayor of Salt Lake City |
| Term Start: | 1886 |
| Term End: | 1890 |
| Predecessor: | James Sharp |
| Successor: | George Montgomery Scott |
| Constituency: | Salt Lake City, Utah |
| Birth Date: | 3 October 1839 |
| Birth Place: | Northumberland, England |
| Death Place: | Salt Lake City, Utah, United States |
| Spouse: | Isabella Siddoway |
| Parents: | William and Mary Kirk |
Francis "Frank" Armstrong (3 October 1839 – 15 June 1899) was the fifth mayor of Salt Lake City, serving from 1886 to 1890.[1]
Armstrong was born in Northumberland, England on 3 October 1839. His family migrated to Canada in 1851 in Hamilton, Ontario. Armstrong went to the Richmond, Missouri in 1858 where he worked in a saw mill. He became friends with David Whitmer, one of the Three Witnesses for the Book of Mormon. Armstrong moved to Utah in 1861. He married his first wife Isabella Siddoway on 10 December 1864, and they resided in Salt Lake City permanently. He also polygamously married Sarah Carruth in 1870 and Maren Jensen in 1887. Armstrong was elected as Mayor of Salt Lake City in 1886.[2]
. History of Utah: Comprising Preliminary Chapters on the Previous History of Her Founders Accounts of Early Spanish and American Explorations in the Rocky Mountain Region, the Advent of the Mormon Pioneers, the Establishment and Dissolution of the Provisional Government of the State of Deseret, and the Subsequent Creation and Development of the Territory. 4. 269–270. Orson F. Whitney. George Q. Cannon. 1906.
. The History of Salt Lake City and Its Founders. 47–48. Edward Tullidge. Edward Tullidge. 1850.