| William R. Smedberg III | |
| Birth Date: | 28 September 1902 |
| Birth Place: | Fort Grant, Arizona, U.S. |
| Death Place: | Falls Church, Virginia, U.S. |
| Placeofburial: | Arlington National Cemetery |
| Branch: | United States Navy |
| Rank: | Vice admiral |
| Commands: | Superintendent of the United States Naval Academy |
William Renwick Smedberg III (September 28, 1902 – October 5, 1994) was a vice admiral in the United States Navy. He was Superintendent of the United States Naval Academy in Annapolis, Maryland from March 16, 1956 to June 27, 1958.[1] During World War II, Smedberg served as commanding officer of and . After the war, he served as an aide to Secretary of the Navy James Forrestal.[2] He was a 1926 graduate of the Naval Academy.[3] He is interred in the Arlington National Cemetery along with his father, Brigadier General William Renwick Smedberg Jr., USA, and his son Rear Admiral William Renwick Smedberg IV, USN. Smedberg had also commanded the USS Iowa.