The Spanish Agency for International Development Cooperation (AECID) (Spanish: Agencia Española de Cooperación Internacional para el Desarrollo) is an autonomous agency of the Spanish government responsible for the management of the government's international development cooperation policy.

Its original name was Spanish Agency for International Cooperation (AECI), but Royal Decree 1403/2007, of 26 October, amended its Statute and gave AECID its current name. AECID is a public agency under the aegis of the Ministry of Foreign Affairs, via the Secretariat of State for International Cooperation (SECIPIC).

The Agency is in charge of designing, implementing and managing development cooperation projects and programmes, whether directly, with its own resources, or through collaboration with other national and international bodies and non-governmental organizations. According to the OECD, Spain’s total ODA (USD 4.2 billion, preliminary data) increased in 2022, mostly due to in-donor refugee costs. ODA represented 0.3% of GNI.

AECID's responsibilities are set forth in its Statute. In the framework of its current Management Contract, the Agency is in charge of designing and implementing development cooperation projects and programmes, as well as humanitarian action abroad, either as the only actor or jointly with other Cooperation Agencies.

Another responsibility is to coordinate development policies with Spain's other General State Administration bodies, and with other bilateral and multilateral agencies and organizations, especially within the European Union and the United Nations system. AECID also represents Spain on issues that fall under its mandate, promotes cooperation actions of other institutions, and is in charge of producing and disseminating relevant development studies, as well as exercising the duties and responsibilities assigned to the Ministry of Foreign Affairs in regards to promoting and implementing cultural and scientific relations with other countries.

The Spanish Agency for International Development Cooperation (AECID) was created by Royal Decree 1527/1988, of 11 November, through the integration of several self-governing agencies and other organizational units of the Foreign Ministry. It was last restructured in 2001, with the incorporation of the Directorate-General for Cultural and Scientific Relations.

The Agency's origins date back to 1946, with the foundation of the Institute of Hispanic Culture. The first significant change to its structure was made in 1976, when a Presidency was established as its highest governing body. In 1977, it was restructured for the first time and given a new name: the Ibero-American Centre for Cooperation, together with new responsibilities and powers in the field of cooperation.

From then on, the term "cooperation" became the organization’s hallmark, in its name and in all of its activities.