Bullock has been a public supporter of the American Red Cross and has donated $1 million to the organization at least five times. Her first public donation of that amount was to the Red Cross's Liberty Disaster Relief Fund. Three years later, she sent money in response to the 2004 Indian Ocean earthquake and tsunamis. In 2010, she donated $1 million to relief efforts in Haiti following the Haiti earthquake and again donated the same amount following the 2011 Tōhoku earthquake and tsunami. She donated $1 million in 2017 to support Red Cross relief efforts for Hurricane Harvey in Texas.