| Olin G. Blackwell | |
| Office: | Warden of Alcatraz Federal Penitentiary |
| Term Start: | 1961 |
| Term End: | 1963 |
| Predecessor: | Paul J. Madigan |
| Successor: | Prison closed March 21, 1963 |
| Birth Name: | Olin Guy Blackwell |
| Birth Date: | 15 February 1915 |
| Birth Place: | Georgia, United States |
| Death Place: | Hart County, Georgia, U.S. |
| Occupation: | Prison warden |
Olin Guy Blackwell (February 15, 1915 – March 7, 1986) was an American lawman who was the fourth and final warden of Alcatraz Federal Penitentiary, which was situated on Alcatraz Island, California. Associate Warden to Paul J. Madigan from April 1959,[1] Blackwell served as warden of Alcatraz at its most difficult time from 1961 to 1963, when it was facing closure as a decaying prison and financing problems and at the time of the June 1962 escape. At that time, he was on vacation in Lake Berryessa in Napa County, California, and he didn't believe the men could have survived the waters and made it to shore. The prison closed March 21, 1963. [2]
The prison closed on March 21, 1963. Blackwell was considered to have been the least strict warden of Alcatraz, perhaps in part due to him having been a heavy drinker and smoker, nicknamed "Gypsy" and known as "Blackie" to his friends.[1] He was said to have been an excellent marksman. He had earlier served as Associate Warden of Lewisburg Federal Penitentiary.[1] He died on March 7, 1986, in Hart County Georgia.[3] [4]