Baroness Olga Vadimovna von Root (December 2, 1901 – June 28, 1967) was a Russian stage actress and singer.

During the Russian Revolution, while her father served in the White Army, Root performed in cabarets and nightclubs to help support her family.

She later married the American industrialist Armand Hammer and moved to the United States, taking up residence in Manhattan.

She was the daughter of Baron Vadim Nikolayevich von Root, a Czarist military officer and nobleman, and Lubov Karlovna Kostsyushko-Valyuzhinich, a member of a Polish landed gentry family.

[2] Root was educated at the Smolny Institute of Noble Maidens in Saint Petersburg, where she trained as a singer.

[2] During the rise of Communism, Root became a star of the stage, as a singer and actress, performing under the name of Olga Vadina.

[3] While living in New York City with her second husband, Armand Hammer, Root worked with a musician to transcribe Russian and Romani music that she learned throughout her training.