Isobel "Iso" Rae (18 August 1860 – 16 March 1940) was an Australian impressionist painter.
After training at Melbourne's National Gallery of Victoria Art School, where she studied alongside Frederick McCubbin and Jane Sutherland, Rae travelled to France in 1887 with her family, and spent most of the rest of her life there.
A longstanding member of the Étaples art colony, Rae lived in or near the village of Étaples from the 1890s until the 1930s.
During that period, Rae exhibited her paintings at the Royal Society of British Artists, the Society of Oil Painters, and the Paris Salon.
During World War I, she was a member of the Voluntary Aid Detachment and worked throughout the war in Étaples Army Base Camp.
She and Jessie Traill were the only Australian women to live and paint in France during the war, however they were not included in their country's first group of official war artists.
Following Hitler's rise to power, Rae moved to south-eastern England, where she died in 1940.