Ernest S. Marsh (January 10, 1903 – October 9, 1975) was president of the Santa Fe Railway system from 1957 through 1966.

He was instrumental in forming the railway's holding company, Santa Fe Industries,[1][2] and served on the board of directors for the Regional Transportation Authority in Illinois.

Marsh ascended to the presidency of the Santa Fe on May 1, 1957,[4] succeeding Fred G. Gurley, who had served in that position since 1944.

Marsh finally retired from the Santa Fe on January 31, 1973,[6] but remained as a member of the board of directors until his death.

[1][2] Chicago Mayor Richard J. Daley appointed Marsh to a two-year term on the board of directors for the Regional Transportation Authority in June 1974.