Gleb Semyonovich Shishmaryov (Russian: Глеб Семёнович Шишмарёв; 1781 - November 3, 1835, Saint Petersburg) was a rear admiral of the Imperial Russian Navy. He is reputed for having surveyed the then little-known coast of Alaska as navigator. In 1815–1818 he accompanied Otto von Kotzebue on his voyage to Alaska and around the world.