| Honorific-Prefix: | The Honorable |
| Ernest C. Keppler | |
| Office: | for the |
| Term Start: | January 1, 1979 |
| Term End: | July 31, 1985 |
| Predecessor: | Daniel P. Anderson |
| Successor: | L. Edward Stengel |
| State1: | Wisconsin |
| State Senate1: | Wisconsin |
| District1: | 20th |
| Term Start1: | January 2, 1961 |
| Term End1: | January 1, 1979 |
| Predecessor1: | Harold F. Huibregtse |
| Successor1: | David W. Opitz |
| State Assembly2: | Wisconsin |
| District2: | Sheboygan 1st |
| Term Start2: | January 4, 1943 |
| Term End2: | January 1, 1945 |
| Predecessor2: | Joseph M. Theisen |
| Successor2: | John Schneider Jr. |
| Party: | Republican |
| Birth Date: | 5 April 1918 |
| Birth Place: | Sheboygan, Wisconsin, U.S. |
| Death Place: | Sheboygan Memorial Medical Center Sheboygan, Wisconsin, U.S. |
| Restingplace: | Wildwood Cemetery, |
| Children: | 2 |
| Allegiance: | United States |
| Branch: | United States Army |
| Rank: | 1st Sergeant |
| Battles: | World War II |
Ernest C. Keppler (April 5, 1918May 23, 2001) was an American lawyer, jurist, and Republican politician from Sheboygan County, Wisconsin. He served 18 years in the Wisconsin Senate, representing the 20th Senate district from 1961 to 1979, and then served six years as Wisconsin circuit court judge in Sheboygan County. Earlier in life, he also served one term in the Wisconsin State Assembly (1943).
Born in Sheboygan, Wisconsin, Keppler graduated from the University of Wisconsin and received his law degree from the University of Wisconsin Law School. Keppler served on the Sheboygan Common Council. In 1943, he served in the Wisconsin State Assembly. Keppler served in the United States Army during World War II and the Korean War. In 1961, Keppler began serving in the Wisconsin State Senate. In 1979, he was elected a Wisconsin Circuit Court judge, for Sheboygan County, Wisconsin.[1] [2]
Keppler was married to Bertha Keppler. They had two children, Ernest Michael Keppler and Mary Keppler (Schmidt).