Ernest C. Keppler (April 5, 1918 – May 23, 2001) was an American lawyer, jurist, and Republican politician from the U.S. state of Wisconsin. He served six years (1979–1985) as a Wisconsin circuit court judge in Sheboygan County, after representing Ozaukee and Sheboygan counties in the Wisconsin State Senate for 18 years (1961–1979).