Robert Powell Smith (March 5, 1929 – January 20, 2012) was an American diplomat.

Smith served in the United States Marine Corps.

Smith was appointed by President Richard Nixon on July 23, 1974, to the position of United States Ambassador to Malta.

Smith was then appointed by President Gerald Ford on October 4, 1976, to the position of United States Ambassador to Ghana.

Smith's final diplomatic appointment was made by President Jimmy Carter on July 2, 1979, for the position of United States Ambassador to Liberia.