Eduardo Humberto del Río García (June 20, 1934 – August 8, 2017), better known by his pen name Rius, was a Mexican intellectual, political cartoonist and writer born in Zamora, Michoacán.

Rius was a fierce political activist, and his progressive and left-wing point of view is often present in his writings, accompanied by a strong criticism about neoliberal Mexican doctrines, US Government policies, and the Catholic Church.

He used to be an open advocate of the Cuban revolution as in Cuba for Beginners and a strong Soviet bloc sympathizer until the end of the Cold War.

After his successes with these, he made many books, all illustrated and written by hand by him and covering a range of topics on politics, vegetarianism, and religion.

Mexican director Alfonso Arau made Calzonzin Inspector, a live action film based on characters appearing in Los Supermachos that was released in 1974.