John Milton Sandidge (January 7, 1817 – March 30, 1890) was a U.S. Representative from Louisiana.

He served as chairman of the Committee on Private Land Claims (Thirty-fifth Congress).

When Brigadier General Henry Watkins Allen was made Governor of Louisiana, he called Colonel Sandidge to his staff as Chief of Ordnance, the position he held until the close of hostilities.

Sandidge surrendered the archives of the State by special request of Governor Allen.

[1] He died in Bastrop, Louisiana, on March 30, 1890, and was interred in Christ Church Cemetery.