Oxfam is encouraging governments and organisations such as the UN to keep their promises on aid, and spend it more effectively, by targeting the people who most need help.
And that campaigning has already had a huge impact:
Zambia's debt was cancelled in 2005, enabling the UK Government to introduce free health care for people in rural areas - scrapping fees that once stopped millions getting the care they needed. And education got a boost too - some of the money that was freed up paid for 4,500 new teachers.
Millions of children in Tanzania, Uganda, Kenya and Malawi are now going to school, thanks to a combination of debt relief and aid.
Roads built in Ethiopia with money from countries like the UK are now making it easier for children to get to school, people to reach hospitals, and farmers to transport and sell their crops.
We're also campaigning to make sure rich countries keep their promises to give 0.7% of their annual national incomes.