Clooney's co-stars Brad Pitt, Matt Damon and Don Cheadle and the movie's
producer Jerry Weintraub all contributed to the Oxfam donation, through
Clooney's charitable organisation Not On Our Watch.
Global relief agency Oxfam will use the proceeds to help families in
war-torn Darfur.
Clooney said: "The people of Darfur urgently need the help of organisations
like Oxfam."
The stars' donation will help provide clean water and other aid to 500,000
people who have been displaced from their homes in Darfur and neighbouring
Chad.
Oxfam's international director Penny Lawrence said: "This is a fantastic
donation from the 'Ocean's 13' stars. It will make a massive difference to
some of the most vulnerable people in the world."
Clooney, 46, has been an active advocate for a resolution to the Darfur
conflict for years.
In 2005, the actor spoke at a Save Darfur rally in Washington and the
following year spent ten days in the region making a film to highlight the
plight of its people.
Clooney had taken his campaign to the Security Council of the United Nations
and has lobbied various worldwide governments to help ease the situation.