Aleksandr Leonovitch Granin is a fictional character in the video game Metal Gear Solid 3: Snake Eater. He is the director of the Graniny Gorki Research and Design Lab, and has been twice awarded the Order of Lenin, which he wears proudly on his suit jacket.

Granin is revealed to be the original designer of the Metal Gear weapon, although Volgin and the USSR decide that Sokolov's idea of the rocket-equipped Shagohod tank is a greater idea, which leaves Granin greatly embittered. He sends all of his data on the Metal Gear to his friend in America, the father of Hal Emmerich, which will eventually be used by Hal to build Metal Gear REX almost five decades later. Granin, drowning his sorrows, is confronted by Naked Snake and decides to help him with his mission to rescue Sokolov and get him back to the United States, thereby eliminiating his reserach rival, and hopefully having the Shagohod destroyed in the process. Granin would not live to see if his plan would come to fruition, as Volgin, suspecting Granin of being the spy aiding Snake, "interrogates" him by putting him inside a large steel barrel and pounding away at it with his electrically-charged attacks, eventually killing Granin.