Gertrude Marianne Achenbach Coor (1915 - 1962) was a German-American art historian.
In 1933, she moved to Italy, then Wales, and then the United States.
She was research assistant to the art historian Millard Meiss.
[3] Gertrude Coor wrote on artists including Coppo di Marcovaldo and Ugolino di Nerio.
In 1961 she published a monograph on Neroccio di Bartolomeo de' Landi.