The phrase "aid agency" is correct and usable in written English.
An example sentence could be: "The local aid agency is working to provide financial assistance to those affected by the hurricane."
This paper presents a case study examining the evolution of a social accounting process in an Irish overseas aid agency, the Agency for Personal Service Overseas.
The German aid agency G.T.Z.
He tried to run the Quai as an aid agency.
A new aid agency would ram the point home.
When kidnapped, he was working for the aid agency Acted.
The aid agency is providing specialist help to children to recover from their experiences.
The self-aggrandizing director of WorldCares/ChildrenFirst, the novel's fictional aid agency, is especially well drawn.
Or perhaps he could work for a foreign aid agency there, he said.
USAID, America's government aid agency, now includes "crisis modifiers" in some of its programmes.
Canada's aid agency has got rid of the forestry adviser in its policy branch.
The aid agency says it does not work that way in practice.
