Gallatin is a city in Daviess County, Missouri, United States. The population was 1,789 at the 2000 census. It is the county seat of Daviess County.
The Gallatin Election Day Battle took place in 6 August 1838, when about 200 people attempted to forcibly prevent Mormons from voting in the newly created county's first election. The skirmish is often cited as the opening event of the 1838 Mormon War.
The Daviess County Rotary Jail (Squirrel Cage Jail) and Sheriff's Residence, the A.T. Ray Home and the Daviess County Courthouse are on the National Register of Historic Places.