Frederick Ernest Koeller
- Born: 12 May 1875
- Marriage (1): Louise Anna Fritz on 1 Feb 1899 in British Hollow, Grant County, WI
- Died: 28 Jul 1964, Potosi, WI at age 89
- Buried: Van Buren Cemetery, Potosi, WI
Another name for Frederick was Fritz Ernest Koeller.
Frederick married Louise Anna Fritz, daughter of Carl Herman Fritz and Wilhemina Koeller, on 1 Feb 1899 in British Hollow, Grant County, WI. (Louise Anna Fritz was born on 6 Apr 1880 in Munich, Germany, died on 25 Dec 1968 in Potosi, WI and was buried in Van Buren Cemetery, Potosi, WI.)