John Lackner Ducker (September 3, 1922 – April 15, 2014) was an American politician in the state of Florida. He was an attorney by profession. Ducker was born in Fort Thomas, Kentucky. He attended Yale University and Yale Law School, attaining his law degree in 1950. He served in the Florida House of Representatives from 1960 to 1968.He was elected to the State Senate in 1968, serving until 1971.