Institut Gustave Roussy (French pronunciation: [ɛ̃stity ɡystav ʁusi]), sometimes called Gustave Roussy, is a cancer research hospital in Europe. It is located near Paris. It is named after Gustave Roussy, a Swiss-French neuropathologist.

In April 2019, three new interventional radiology rooms were inaugurated, making it the largest facility of this type in Europe dedicated to oncology. Gustave Roussy carries out more than 4,000 interventional radiology procedures each year.

Together with the Faculty of Medicine of the University of Paris-Saclay, the Institut Gustave Roussy runs the School of Cancer Sciences, a university division specializing in oncology. The lessons take place at the Cancer Campus in Villejuif in the Val-de-Marne.

In the various courses offered by the faculty of medicine (adult, adolescent and child oncology; surgery; best practices; medical imaging; radiotherapy; other courses), the establishment integrates the Doctoral School of Oncology, Biology, Medicine, Health (and its Master 2 in Biology and Health, Cancerology specialty), created with the École Normale Supérieure Paris-Saclay.

Directed in 2015 by Pierre Blanchard, the school had trained nearly 2,800 students and awarded 26 university degrees.

In 2020, the Institut Gustave Roussy was ranked as the first leading cancer hospital in Europe and in the top five best specialized hospitals in the world.

In 2017, a virologist from the Institut Gustave Roussy was sentenced to 5 years in prison for poisoning colleagues with sodium azide in 2014.

48°47′41″N 2°20′55″E / 48.79472°N 2.34861°E / 48.79472; 2.34861