Waldo Porter Johnson (September 16, 1817 – August 14, 1885) was an American lawyer and politician who served as a Missouri state representative, as well as briefly as a U.S.

He was a member of the peace convention of 1861 held in Washington, D.C., in an effort to devise means to prevent the impending American Civil War.

Johnson volunteered to serve in the Confederate Army during the Civil War, having attained the rank of Major in the Missouri State Guard.

On April 28, 1862 his unit was re organized in Memphis Tennessee as the 4th Missouri Infantry Regiment (Confederate) with Johnson as lieutenant colonel.

[3][4] In the 1860 census, Johnson's real estate and personal property values had soared, and his family included 11 year old W.T.

[7] He was reburied in the elaborate family tomb at Forest Hill Calvary Cemetery in Kansas City, Missouri.