Lelio Basso was an Italian democratic socialist politician, political scientist and journalist.

The Russell Tribunal, also known as the International War Crimes Tribunal, Russell–Sartre Tribunal, or Stockholm Tribunal, was a private People's Tribunal organised in 1966 by Bertrand Russell, British philosopher and Nobel Prize winner, and hosted by French philosopher and writer Jean-Paul Sartre, along with Lelio Basso, Simone de Beauvoir, Vladimir Dedijer, Ralph Schoenman, Isaac Deutscher, Günther Anders and several others. The tribunal investigated and evaluated American foreign policy and military intervention in Vietnam.