| Chauncey I. Filley | |
| Order: | 18th Mayor of St. Louis, Missouri |
| Term Start: | April 14, 1863 |
| Term End: | March 19, 1864 |
| Predecessor: | Daniel G. Taylor |
| Successor: | James S. Thomas |
| Birth Date: | October 17, 1829 |
| Birth Place: | Lansingburgh, New York |
| Death Place: | Overland, Missouri |
| Party: | Republican |
Chauncey Ives Filley (17 October 1829 - 24 September 1923) was a United States politician active in Missouri.
Filley was born in Lansingburg, New York. He received a private and academic education and entered commercial life as a clerk. He designed and controlled his own pottery patterns and became the largest importer and distributor of queensware in the Mississippi Valley. He became interested in politics and became the eighteenth mayor of St. Louis, Missouri, in 1863. He resigned from office because of illness after serving only one year of his two-year term.[1]
Filley was a delegate to the Republican National Conventions from 1864 to 1896 and was a member of the Republican National Committee from 1876 to 1892. He was a member of the convention which abolished slavery in the state. From 1873 to 1878, he was postmaster of St. Louis. He is buried at Bellefontaine Cemetery.