John Floyd King (April 20, 1842 – May 8, 1915) was a U.S. Representative from Louisiana.

King attended the Russell School, New Haven, Connecticut, Bartlett's College Hill School, Poughkeepsie, New York, the Military Institute of Georgia, and the University of Virginia at Charlottesville.

He was admitted to the bar in 1872 and commenced practice in Vidalia, Louisiana.

King was elected inspector of levees and president of the board of school directors of his district and also a trustee of the University of the South.

He served as chairman of the Committee on Levees and Improvements of the Mississippi River (Forty-eighth and Forty-ninth Congresses).