Gerharda/Grada Hermina Marius (1854-1919) was a Dutch art historian, critic, and painter. She studied at the Amsterdam Academy of Fine Arts, and in 1883 lived in The Hague. Between 1895 and 1907, she was art critic for the newspaper Het Vaderland, and from 1907-1916, for Het Nieuws van den Dag. She authored and translated many works on art and artists.