The humanitarian response to the 2004 Indian Ocean earthquake of a magnitude of 9.2–9.3 was prompted by one of the worst natural disasters of modern times. On 26 December 2004, the earthquake, which struck off the northwest coast of the Indonesian island of Sumatra, generated a tsunami that wreaked havoc along much of the rim of the Indian Ocean. Particularly hard-hit were the countries of Indonesia, India, Sri Lanka and Thailand. About 230,000 people were killed, tens of thousands more were injured, and 1.7 million became homeless and displaced.

Contributing countries and supra-national organizations Asian expatriates, governments, humanitarian organisations and individuals around the world arrived, eager to offer aid and technical support. The global scale of the disaster led to three rapid activations of the International Charter on Space and Major Disasters: by the French Civil Protection Agency for Sri Lanka, by the Indian space agency ISRO the Maldives, for India, particularly the Andaman and Nicobar Islands in the southeast, and by the United Nations Office for Outer Space Affairs (UNOOSA), acting on behalf of the United Nations Office for Project Services (UNOPS), for Indonesia and Thailand. The World Bank initially estimated the amount of aid needed at USD $4-5 billion. Although numerous countries provided help for relief and assistance, the UN criticised both the US and Europe for providing inadequate resources. By 1 January 2005 over US$1.8 billion (£1bn) had been pledged.

In wake of the disaster, Australia, India, Japan and the United States formed a coalition to coordinate aid efforts to streamline immediate assistance. However, at the Jakarta Summit on 6 January 2005, the coalition transferred responsibilities to the United Nations.

Criticism of donor response Throughout the entire period of the main response to the tsunami disaster – from December 2004 for the next four or five years – there was much debate about both the size and form of way that assistance was delivered. For example, just one day after the tsunami, on 27 December 2004, UN Undersecretary-General for Humanitarian Affairs Jan Egeland reportedly categorised the contributions of rich countries as "stingy". This was widely misinterpreted in the media as categorising the overall response to the tsunami whereas Mr Egeland later explained that at the time he had been making a general remark about overall global aid flows in recent years. Speaking at a press conference later Mr. Egeland said, "It has nothing to do with any particular country or the response to this emergency. We are in early days and the response has so far been overwhelmingly positive". The U.S. government, led by President George W. Bush and Secretary of State Colin Powell, added another US$20 million on 28 December to the original U.S. pledge of US$15 million, bringing the total up to US$35 million (not including direct aid rendered by naval vessels dispatched to the region). Initially, the U.S. Navy dispatched P-3C Orion patrol aircraft and an aircraft carrier to assist with relief operations.The P-3C surveillance aircraft conducted survey operations, including search-and-rescue efforts, and cargo planes shuttled supplies to shelter the living and dry ice to preserve the dead from Bangkok to affected areas. See Rhoda Margesson, CRS Report for Congress. Indian Ocean Earthquake and Tsunami: Humanitarian Assistance and Relief Operations Updated 10 February 2005. Retrieved from https://sgp.fas.org/crs/row/RL32715.pdf on 11 April 2008.

On 31 December the US pledge was increased tenfold to US$350 million, with President Bush saying that that amount would probably increase further. President Bush also signed a decree ordering flags to be flown at half-mast during the first week of the new year, from January 3rd through sunset on the 7th.

During the early period of the response to the tsunami, concerns were voiced in various quarters that the international relief effort might falter if nations did not honour their initial pledges. On 3 January 2005, UN Secretary-General Kofi Annan urged donor nations to ensure that their pledges were fully honoured, pointing to previous cases where "we got lots of pledges, but we did not receive all the money".The Secretary-General's Statements. Un.org (30 November 2011).

On 5 January, as countries jockeyed to make large donations, Jan Egeland said, "I'd rather see competitive compassion than no compassion", adding that too many countries were making pledges without any guarantee that the funds would arrive. Following the earthquake the previous year in Iran in Bam which killed 26,000 people, Iranian officials claimed to have received just US$17.5 million of the US$1 billion originally pledged. In mid-March 2005, the Asian Development Bank reported that the provision of over US$4 billion in aid promised by governments was behind schedule. Sri Lanka criticised the nations and organisations that clamoured to pledge donations, "Not a penny had come through yet. We are doing the relief work with our government money. Sri Lanka is still waiting for the money pledged by the donors. Money pledged by the people has been pledged to the NGOs."BBCSinhala.com. Bbc.co.uk (17 March 2005).

Sri Lanka's Foreign Minister, Lakshman Kadirgamar, stated in a BBC interview, "A lot of aid what has been coming in latterlysic is I'm afraid – I'm sorry to say – not very useful. For instance there was a container full of teddy bears. They're obviously given with good will, nobody says no to that." The patience of tsunami affected nations was being stretched: "Now the government had worked out a scheme that until 26 April everything that has come, everything that will be on the seas will be admitted tax free. After that, no!". Kadirgamar went on to say, "For instance we do not need rice, we are expecting a bumper harvest, anyone who sends rice is wasting their time and money."

Many commentators claim excessive and competitive donor responses threaten less dramatic but equally important relief efforts elsewhere. "While everyone opens up their coffers for these disasters, the ongoing toll from malaria, AIDS and tuberculosis is much larger than these one-time events", said Enriqueta Bond, president of the US Burroughs Wellcome Fund. "We would do more good to invest in prevention and good public-health measures such as clean water". Tony Blair, the British prime minister, also expressed concern that tsunami aid could detract from other pressing development needs. He pointed out that there was a disaster comparable to a "preventable tsunami every week in Africa", where 10,000 people die daily from AIDS and malaria alone.

Criticism of recipient response In the early stages, before the extent of the disaster was clear, Sri Lanka refused Israel's offers of aid, objecting to the inclusion of 60 Israeli soldiers in the 150-person mission planned by Israel's army, to set up field hospitals, including internal medicine and paediatric clinics, an Israeli army spokesman reported to BBC. Later, the Israeli humanitarian organization sent a jumbo jet carrying 18.5 tonnes of supplies to Colombo, however, and a rescue-and-recovery team from the Jewish ultra-Orthodox organization ZAKA arrived in Colombo with equipment used for identifying bodies, as well as body bags.28 December 2004. BBC News (28 December 2004). Corruption, bureaucracy and nationalism hampered the humanitarian response in Indonesia.

In Sri Lanka, only 30% of those eligible affected by the tsunami as of 10 February had received any aid, and there were allegations of local officials giving aid only to their supporters, some of whom were not victims of the tsunami. The Sri Lankan government has set up a "Special Complaint Unit" for citizens to record grievances.

List of donors The following table is a partial listing of cash commitments from various governments and nongovernmental organisations, taken fromthe BBC. BBC News (27 January 2005). and other sources:CNN.com – Spain flies in tsunami aid relief – 30 December 2004. CNN (30 December 2004).

Note: Exchange rates were taken on 8 January 2005, when €1 = US$1.30585; GBP 1 = US$1.87110; CAD 1 = US$0.811853; AUD 1 = US$0.757346; HKD 1 = US$0.1282; 1 INR= US$0.0228102; 1 CNY= 0.120831; 1 NOK = US$0.158526; 1 DKK = 0.175711; 1 SEK = US$0.144363; and 1 CHF = US$0.844131.