The Alfred G. Vanderbilt Handicap is a Grade I American thoroughbred horse race for horses age three and older over a distance of six furlongs on the dirt held annually in late July at Saratoga Race Course in Saratoga Springs, New York.
The inaugural running of the event was on 17 August 1985 as the A Phenomenon Stakes, the sixth event on the card that day and was won by the Richard E. Dutrow Sr. trained Cognizant, who won in a time of 1:093⁄5.
The event was named after the winner of the 1983 Jim Dandy Stakes at Saratoga, A Phenomenon.
In 2000, the event was renamed to honor Alfred Gwynne Vanderbilt Jr. who had died in 1999.
Vanderbilt was a very prominent Thoroughbred owner who also served as chairman of the board of the New York Racing Association from 1971 to 1975.