| Intro | American politician |
| Was | Politician |
| From | United States of America |
| Type | Politics |
| Gender | male |
| Birth | 29 April 1865, Topsham, Vermont |
| Death |
28 September 1953, Pasadena (aged 88 years) |
Frederick John Mills (April 28, 1865 – September 28, 1953) was a Republican politician and prominent engineer from Idaho. He served as the fourth Lieutenant Governor of Idaho. Mills was elected in 1895 along with Governor William J. McConnell. Mills also served as State Engineer of Idaho from 1895 until 1897.