Ralph Arnold Tudor (March 19, 1902 – November 12, 1963) was an American builder, civil engineer and Under Secretary of the United States Interior Department.

[4] Tudor returned to the Army during World War II, serving as a colonel in the Corps of Engineers from March 1941 to April 1946.

[6][7] Tudor was acquainted with Douglas McKay, a former governor of Oregon, who was appointed Secretary of the Interior by President Dwight D. Eisenhower.

Tudor coordinated the Department's legislative program and was involved with a number of environmental issues that arose during the early years of the Eisenhower administration, including the Hells Canyon and Echo Park controversies.

[3] He died from a heart attack at his home in Atherton, California on November 12, 1963, and was buried at West Point Cemetery.